libraptor

libraptor(3)               Library Functions Manual               libraptor(3)



NAME
       libraptor - Raptor RDF parser and serializer library

SYNOPSIS
       #include <raptor.h>

       raptor_init();
       raptor_parser *p=raptor_new_parser("rdfxml");
       raptor_set_statement_handler(p,NULL,print_triples);
       raptor_uri *file_uri=raptor_new_uri("http://example.org/");
       raptor_parse_file(p,file_uri,base_uri);
       raptor_parse_uri(p,uri,NULL);
       raptor_free_parser(p);
       raptor_free_uri(file_uri);
       raptor_finish();

       cc file.c -lraptor

DESCRIPTION
       The Raptor library provides a high-level interface to a set of parsers
       and serializers that generate Resource Description Framework (RDF)
       triples by parsing syntaxes or serialize the triples into syntaxes.

       The supported parsing syntaxes include RDF/XML, N-Triples, Turtle,
       TRiG, RSS tag soup (including all RSS and Atoms), GRDDL, RDFa and the
       serializing syntaxes include RDF/XML (3 varieties), N-Triples, Turtle,
       RSS 1.0, Atom 1.0, GraphViz DOT and RDF/JSON.  The RDF/XML parser can
       use either expat or libxml XML parsers for providing the SAX event
       stream.  The library functions are arranged in an object-oriented style
       with constructors, destructors and method calls.  The statements and
       error messages are delivered via callback functions.

       Raptor contains a URI-reference parsing and resolving (not retrieval)
       class (raptor_uri) sufficient for dealing with URI-references inside
       RDF.  This functionality is modular and can be transparently replaced
       with another existing and compatible URI implementation.

       It also provides a URI-retrieval class (raptor_www) for wrapping
       existing library such as libcurl, libxml2 or BSD libfetch that provides
       full or partial retrieval of data from URIs and an I/O stream
       abstraction (raptor_iostream) for supportin serializing to a variety of
       outputs.

       Raptor uses Unicode strings for RDF literals and URIs and preserves
       them throughout the library.  It uses the UTF-8 encoding of Unicode at
       the API for passing in or returning Unicode strings.  It is intended
       that the preservation of Unicode for URIs will support
       Internationalized Resource Identifiers (IRIs) which are still under
       development and standardisation.

LIBRARY INITIALISATION AND CLEANUP
       raptor_init()

       raptor_finish()
              Initialise and cleanup the library.  These must be called before
              any raptor class such as raptor_parser, raptor_uri is created or
              used.  Note: as of 1.4.19 these are wrappers around a static
              instance of the new raptor_world class.  In Raptor 2.0 this
              initialisation and cleanup method will be removed.

       void raptor_set_libxslt_security_preferences(void
       *security_preferences)
              Set libxslt security preferences object.

       void raptor_set_libxml_flags(int flags)
              Set libxml flags from the choices:
              RAPTOR_LIBXML_FLAGS_GENERIC_ERROR_SAVE: save/restore the libxml
              generic error handler when parsing and
              RAPTOR_LIBXML_FLAGS_STRUCTURED_ERROR_SAVE: save/restore the
              libxml structured error handler when parsing.

PARSER CLASS
       This class provides the functionality of turning syntaxes into RDF
       triples - RDF parsing.

PARSER CONSTRUCTORS
       raptor_parser* raptor_new_parser(name)
              Create a new raptor parser object for the parser with name name
              currently either "rdfxml", "turtle" or "rss-tag-soup" for the
              RSS Tag Soup parser.

       raptor_parser* raptor_new_parser_for_content(raptor_uri *uri, const
       char *mime_type, const unsigned char *buffer, size_t len, const
       unsigned char *identifier)
              Create a new raptor parser object for a syntax identified by URI
              uri, MIME type mime_type, some initial content buffer of size
              len or content with identifier identifier.  See the
              raptor_guess_parser_name description for further details.

PARSER DESTRUCTOR
       void raptor_free_parser(raptor_parser *parser)
              Destroy a Raptor parser object.

PARSER MESSAGE CALLBACK METHODS
       Several methods can be registered for the parser that return a
       variable-argument message in the style of printf(3).  These also return
       a raptor_locator that can contain URI, file, line, column and byte
       counts of where the message is about. This structure can be used with
       the raptor_format_locator, raptor_print_locator functions below or the
       structures fields directly, which are defined in raptor.h

       void raptor_set_fatal_error_handler(raptor_parser* parser, void
       *user_data, raptor_message_handler handler)
              Set the parser fatal error handler callback.

       void raptor_set_error_handler(raptor_parser* parser, void *user_data,
       raptor_message_handler handler)
              Set the parser non-fatal error handler callback.

       void raptor_set_warning_handler(raptor_parser* parser, void *user_data,
       raptor_message_handler handler)
              Set the parser warning message handler callback.

       raptor_set_namespace_handler(raptor_parser* parser, void* user_data,
       raptor_namespace_handler handler)
              Set the namespace declaration handler callback.

PARSER STATEMENT CALLBACK METHOD
       The parser allows the registration of a callback function to return the
       statements to the application.

       void raptor_set_statement_handler(raptor_parser* parser, void
       *user_data, raptor_statement_handler handler)
              Set the statement callback function for the parser.  The
              raptor_statement structure is defined in raptor.h and includes
              fields for the subject, predicate, object of the statements
              along with their types and for literals, language and datatype.

PARSER PARSING METHODS
       These methods perform the entire parsing in one method.  Statements
       warnings, errors and fatal errors are delivered via the registered
       statement, error etc. handler functions.

       In both of these methods, the base URI is required for the RDF/XML
       parser (name "rdfxml") and Turtle parser (name "turtle").  The N-
       Triples parser (name "ntriples") or RSS Tag Soup parser (name "rss-tag-
       soup") do not use this.

       int raptor_parse_file(raptor_parser* parser,  raptor_uri *uri,
       raptor_uri *base_uri)
              Parse the given filename (a URI like file:filename) according to
              the optional base URI base_uri.  If uri is NULL, read from
              standard input and base_uri is then required.

       int raptor_parse_file_stream(raptor_parser* parser, FILE* stream, const
       char* filename, raptor_uri *base_uri)
              Parse the given C FILE* stream according to the base URI
              base_uri (required).  filename is optional and if given, is used
              for error messages via the raptor_locator structure.

       int raptor_parse_uri(raptor_parser* parser,  raptor_uri* uri,
       raptor_uri *base_uri)
              Parse the URI according to the base URI base_uri, or NULL if not
              needed.  If no base URI is given, the uri is used.  This method
              depends on the raptor_www subsystem (see WWW Class section
              below) and an existing underlying URI retrieval implementation
              such as libcurl, libxml or BSD libfetch to retrieve the content.

PARSER CHUNKED PARSING METHODS
       These methods perform the parsing in parts by working on multiple
       chunks of memory passed by the application.  Statements warnings,
       errors and fatal errors are delivered via the registered statement,
       error etc. handler functions.

       int raptor_start_parse(raptor_parser* parser, const char *uri)
              Start a parse of chunked content with the base URI uri or NULL
              if not needed.  The base URI is required for the RDF/XML parser
              (name "rdfxml") and Turtle parser (name "turtle").  The N-
              Triples parser (name "ntriples") or RSS Tag Soup parser (name
              "rss-tag-soup") do not use this.

       int raptor_parse_chunk(raptor_parser* parser,  const unsigned char
       *buffer, size_t len, int is_end)
              Parse the memory at buffer of size len returning statements via
              the statement handler callback.  If is_end is non-zero, it
              indicates the end of the parsing stream.  This method can only
              be called after raptor_start_parse().

PARSER UTILITY METHODS
       const char* raptor_get_mime_type(raptor_parser* rdf_parser)
              Return the MIME type for the parser.

       void raptor_set_parser_strict(raptor_parser *parser, int is_strict)
              Set the parser to strict (is_strict not zero) or lax (default)
              mode.  The detail of the strictness can be controlled by
              raptor_set_feature.

       int raptor_set_feature(raptor_parser *parser, raptor_feature feature,
       int value)
              Set a parser feature feature to a particular value.  Returns non
              0 on failure or if the feature is unknown.  The current defined
              parser features are:
                Feature                                 Values
                RAPTOR_FEATURE_ALLOW_BAGID              Boolean (non 0 true)
                RAPTOR_FEATURE_ALLOW_NON_NS_ATTRIBUTES  Boolean (non 0 true)
                RAPTOR_FEATURE_ALLOW_OTHER_PARSETYPES   Boolean (non 0 true)
                RAPTOR_FEATURE_ALLOW_RDF_TYPE_RDF_LIST  Boolean (non 0 true)
                RAPTOR_FEATURE_ASSUME_IS_RDF            Boolean (non 0 true)
                RAPTOR_FEATURE_CHECK_RDF_ID             Boolean (non 0 true)
                RAPTOR_FEATURE_HTML_LINK                Boolean (non 0 true)
                RAPTOR_FEATURE_HTML_TAG_SOUP            Boolean (non 0 true)
                RAPTOR_FEATURE_MICROFORMATS             Boolean (non 0 true)
                RAPTOR_FEATURE_NON_NFC_FATAL            Boolean (non 0 true)
                RAPTOR_FEATURE_NORMALIZE_LANGUAGE       Boolean (non 0 true)
                RAPTOR_FEATURE_NO_NET                   Boolean (non 0 true)
                RAPTOR_FEATURE_RELATIVE_URIS            Boolean (non 0 true)
                RAPTOR_FEATURE_SCANNING                 Boolean (non 0 true)
                RAPTOR_FEATURE_WARN_OTHER_PARSETYPES    Boolean (non 0 true)
                RAPTOR_FEATURE_WWW_TIMEOUT              Integer
                RAPTOR_FEATURE_WWW_HTTP_CACHE_CONTROL   String
                RAPTOR_FEATURE_WWW_HTTP_USER_AGENT      String

       If the allow_bagid feature is true (default true) then the RDF/XML
       parser will support the rdf:bagID attribute that was removed from the
       RDF/XML language when it was revised.  This support may be removed in
       future.

       If the allow_non_ns_attributes feature is true (default true), then the
       RDF/XML parser will allow non-XML namespaced attributes to be accepted
       as well as rdf: namespaced ones.  For example, 'about' and 'ID' will be
       interpreted as if they were rdf:about and rdf:ID respectively.

       If the allow_other_parsetypes feature is true (default true) then the
       RDF/XML parser will allow unknown parsetypes to be present and will
       pass them on to the user.  Unimplemented at present.

       If the allow_rdf_type_rdf_list feature is true (default false) then the
       RDF/XML parser will generate the idList rdf:type rdf:List triple in the
       handling of rdf:parseType="Collection".  This triple was removed during
       the revising of RDF/XML after collections were initially added.

       If the assume_is_rdf feature is true (default false), then the RDF/XML
       parser will assume the content is RDF/XML, not require that rdf:RDF
       root element, and immediately interpret the content as RDF/XML.

       If the check_rdf_id feature is true (default true) then rdf:ID values
       will be checked for duplicates and cause an error if found.

       if the html_link feature is true (default true), look for head
       &lt;link&gt; to type rdf/xml for GRDDL parser

       If the html_tag_soup feature is true (default true), use a lax HTML
       parser if an XML parser fails when read HTML for GRDDL parser.

       If the microformats feature is true (default true), look for
       microformats for GRDDL parser.

       If the non_nfc_fatal feature is true (default false) then illegal
       Unicode Normal Form C in literals will give a fatal error, otherwise it
       gives a warning.

       If the normalize_language feature is true (default true) then XML
       language values such as from xml:lang will be normalized to lowercase.

       If the no_net feature is true (default false) then network requests are
       denied.

       If the scanning feature is true (default false), then the RDF/XML
       parser will look for embedded rdf:RDF elements inside the XML content,
       and not require that the XML start with an rdf:RDF root element.

       If the www_timeout feature is set to an integer larger than 0, it sets
       the timeout in seconds for internal WWW URI requests for the GRDDL
       parser.

       If the www_http_cache_control feature is set to a string value (default
       none), it is sent as the value of the HTTP Cache-Control: header in
       requests.

       If the www_http_user_agent feature is set to a string value, it is sent
       as the value of the HTTP User-Agent: header in requests.

       raptor_parser_set_feature_string(raptor_parser *parser, raptor_feature
       feature, const unsigned char *value)
              Set a parser feature feature to a particular string value.
              Returns non 0 on failure or if the feature is unknown.  The
              current defined parser features are given in raptor_set_feature
              and at present only take integer values. If an integer value
              feature is set with this function, value is interpreted as an
              integer and then that value is used.

       int raptor_get_feature(raptor_parser* parser, raptor_feature feature)
              Get parser feature integer values.  The allowed feature values
              and types are given under raptor_features_enumerate.

       const unsigned char* raptor_parser_get_feature_string(raptor_parser
       *parser, raptor_feature feature)
              Get parser feature string values. The allowed feature values and
              types are given under raptor_features_enumerate.

       unsigned int raptor_get_feature_count(void)
              Get the count of features defined.  Prefered to the compile
              time-only symbol RAPTOR_FEATURE_LAST which returns the maximum
              value, not the count.  Added raptor_get_need_base_uri

       int raptor_feature_value_type(const raptor_feature feature)
              Get a raptor feature value tyype - integer or string.

       raptor_locator* raptor_get_locator(raptor_parser* rdf_parser)
              Return the current raptor_locator object for the parser.  This
              is a public structure defined in raptor.h that can be used
              directly, or formatted via raptor_print_locator.

       void raptor_get_name(raptor_parser *parser)
              Return the string short name for the parser.

       void raptor_get_label(raptor_parser *parser)
              Return a string label for the parser.

       void raptor_set_default_generate_id_parameters(raptor_parser*
       rdf_parser, char *prefix, int base)
              Control the default method for generation of IDs for blank nodes
              and bags.  The method uses a short string prefix and an integer
              base to generate the identifier which is not guaranteed to be a
              strict concatenation.  If prefix is NULL, the default is used.
              If base is less than 1, it is initialised to 1.

       void raptor_set_generate_id_handler(raptor_parser* parser, void
       *user_data, raptor_generate_id_handler handler)
              Allow full customisation of the generated IDs by setting a
              callback handler and associated user_data that is called
              whenever a blank node or bag identifier is required.  The memory
              returned is deallocated inside raptor.  Some systems require
              this to be allocated inside the same library, in which case the
              raptor_alloc_memory function may be useful.

       void raptor_parser_set_uri_filter(raptor_parser* parser,
       raptor_uri_filter_func filter, void* user_data)
              Set the URI filter function filter for URIs retrieved during
              parsing by the the raptor_parser.

       int raptor_get_need_base_uri(raptor_parser* rdf_parser)
              Get a boolean whether this parser needs a base URI to start
              parsing.

       unsigned char* raptor_parser_generate_id(raptor_parser* rdf_parser,
       raptor_genid_type type)
              Generate an ID for a parser of type type, either
              RAPTOR_GENID_TYPE_BNODEID or RAPTOR_GENID_TYPE_BAGID.  This uses
              any configuration set by raptor_set_generate_id_handler.

       void raptor_set_graph_handler(raptor_parser* parser, void* user_data,
       raptor_graph_handler handler)
              Set the graph handler callback.

       raptor_world* raptor_parser_get_world(raptor_parser* rdf_parser)
              Get the world object for the given rdf_parser.

PARSER UTILITY FUNCTIONS
       int raptor_parsers_enumerate(const unsigned int counter, const char
       **name, const char **label)
              Return the parser name/label for a parser with a given integer
              counter, returning non-zero if no such parser at that offset
              exists.  The counter should start from 0 and be incremented by 1
              until the function returns non-zero.

       int raptor_syntaxes_enumerate(const unsigned int counter, const char
       **name, const char **label, const char **mime_type, const unsigned char
       **uri-string)
              Return the name, label, mime type or URI string (all optional)
              for a parser syntax with a given integer counter, returning non-
              zero if no such syntax parser at that offset exists.  The
              counter should start from 0 and be incremented by 1 until the
              function returns non-zero.

       int raptor_features_enumerate(const raptor_feature feature, const char
       **name, raptor_uri **uri, const char **label)
              Return the name, URI, string label (all optional) for a parser
              feature, returning non-zero if no such feature exists.

       Raptor features have URIs that are constructed from the URI
       http://feature.librdf.org/raptor- and the name so for example feature
       scanForRDF has URI http://feature.librdf.org/raptor-scanForRDF

       int raptor_syntax_name_check(const char *name)
              Check name is a known syntax name.

       const char* raptor_guess_parser_name(raptor_uri *uri, const char
       *mime_type, const unsigned char *buffer, size_t len, const unsigned
       char *identifier)
              Guess a parser name for a syntax identified by URI uri, MIME
              type mime_type, some initial content buffer of size len or with
              content identifier identifier.  All of these parameters are
              optional and only used if not NULL.  The parser is chosen by
              scoring the hints that are given.

       raptor_feature raptor_feature_from_uri(raptor_uri *uri)
              Turn a URI uri into a raptor feature identifier, or <0 if the
              feature is unknown.  The URIs are described below
              raptor_set_feature.

STATEMENT UTILITY FUNCTIONS
       int raptor_statement_compare(const raptor_statement *s1, const
       raptor_statement *s2)
              Compare two statements and return an ordering between them.

       void raptor_print_statement(const raptor_statement* const statement,
       FILE *stream)
              Print a raptor statement object in a simple format for debugging
              only.  The format of this output is not guaranteed to remain the
              same between releases.

       void raptor_print_statement_as_ntriples(const raptor_statement*
       statement, FILE *stream)
              Print a raptor statement object in N-Triples format, using all
              the escapes as defined in http://www.w3.org/TR/rdf-
              testcases/#ntriples ⟨http://www.w3.org/TR/rdf-
              testcases/#ntriples⟩

       raptor_statement_part_as_counted_string(const void *term,
       raptor_identifier_type type, raptor_uri* literal_datatype, const
       unsigned char *literal_language, size_t* len_p)

       char* raptor_statement_part_as_string(const void *term,
       raptor_identifier_type type, raptor_uri* literal_datatype, const
       unsigned char *literal_language)
              Turns part of raptor statement into N-Triples format, using all
              the escapes as defined in http://www.w3.org/TR/rdf-
              testcases/#ntriples ⟨http://www.w3.org/TR/rdf-
              testcases/#ntriples⟩ The part (subject, predicate, object) of
              the raptor_statement is passed in as term, the part type
              (subject_type, predicate_type, object_type) is passed in as
              type.  When the part is a literal, the literal_datatype and
              literal_language fields are set, otherwise NULL (usually
              object_datatype, object_literal_language).

              If raptor_statement_part_as_counted_string is used, the length
              of the returned string is stored in *len_p if not NULL.

LOCATOR UTILITY FUNCTIONS
       int raptor_format_locator(char *buffer, size_t length, raptor_locator*
       locator)
              This method takes a raptor_locator object as passed to an error,
              warning or other handler callback and formats it into the buffer
              of size length bytes.  If buffer is NULL or length is
              insufficient for the size of the formatted locator, returns the
              number of additional bytes required in the buffer to write the
              locator.

              In particular, if this form is used:
                length=raptor_format_locator(NULL, 0, locator) it will return
              in length the size of a buffer that can be allocated for locator
              and a second call will perform the formatting:
                raptor_format_locator(buffer, length, locator)


       void raptor_print_locator(FILE *stream, raptor_locator* locator)
              This method takes a raptor_locator object as passed to an error,
              warning or other handler callback, formats and prints it to the
              given stdio stream.

       int raptor_locator_line(raptor_locator *locator)
              Returns the line number in a locator structure or <0 if not
              available.

       int raptor_locator_column(raptor_locator *locator)
              Returns the column number in a locator structure or <0 if not
              available.

       int raptor_locator_byte(raptor_locator *locator)
              Returns the byte offset in a locator structure or <0 if not
              available.

       const char * raptor_locator_file(raptor_locator *locator)
              Returns the filename in a locator structure or NULL if not
              available.  Note the returned pointer is to a shared string that
              must be copied if needed.

       const char * raptor_locator_uri(raptor_locator *locator)
              Returns the URI string in a locator structure or NULL if not
              available.  Note this does not return a raptor_uri* pointer and
              the returned pointer is to a shared string that must be copied
              if needed.

N-TRIPLES UTILITY FUNCTIONS
       void raptor_print_ntriples_string(FILE* stream, const char* string,
       const char delim)
              This is a standalone function that prints the given string
              according to N-Triples escaping rules, expecting to be
              terminated by delimiter delim which is usually either ', " or <.
              If a null delimiter \0 is given, no extra escaping is performed.

       int raptor_iostream_write_string_ntriples(raptor_iostream *iostr, const
       unsigned char *string, size_t len, const char delim)
              Write an N-Triples encoded version of the given string to
              iostream iostr.  If delim is given, that is the ending delimeter
              of the encoded string and it will be escaped in the output as
              appropriate.  Useful delim values are ', " and >.  If a null
              delimiter \0 is given, no extra escaping is performed.

       int raptor_iostream_write_string_python(raptor_iostream *iostr, const
       unsigned char *string, size_t len, const char delim, int flags)
              Write string encoded to an iostream according to the delimeter
              delim and encoding flags.  The flag value selects formatting
              according to the appropriate Python-related languages such as N-
              Triples (0), Turtle (1), Turtle long quoted string (2), JSON
              (3).

       void raptor_iostream_write_statement_ntriples(raptor_iostream* iostr,
       const raptor_statement *statement)
              Write an N-Triples encoded version of the raptor_statement
              statement to iostream iostr.

       void raptor_iostream_write_string_turtle(raptor_iostream* iostr, const
       unsigned char* string, size_t len)
              DEPRECATED in 1.4.17 - use raptor_iostream_write_string_python
              instead.  Write an UTF-8 string of length len using the Turtle
              "longString" triple quoting format to the iostream iostr.

       const char* raptor_ntriples_term_as_string (raptor_ntriples_term_type
       term)
              Deprecated, for internal use.

XML UTILITY FUNCTIONS
       int raptor_xml_any_escape_string(const unsigned char* string, size_t
       len, unsigned char* buffer, size_t length, char quote, int xml_version,
       raptor_simple_message_handler error_handler, void* error_data)

       int raptor_xml_escape_string(const unsigned char *string, size_t len,
       unsigned char *buffer, size_t length, char quote,
       raptor_message_handler error_handler, void *error_data)
              Apply the XML escaping rules to the string given in (string,
              len) into the buffer of size length.  If quote is given, the
              escaped content is for an XML attribute and the appropriate
              quote character XML element content (CDATA).   The error_handler
              method along with error_data allow error reporting to be given.
              If buffer is NULL, returns the size of the buffer required to
              escape.  Otherwise the return value is the number of bytes used
              or <0 on failure.

              When an xml_version argument is present and has a value 10 (XML
              1.0) or 11 (XML 1.1) then that version is used.  The default
              with no argument is to generate XML 1.0.

       int raptor_iostream_write_xml_any_escaped_string(raptor_iostream*
       iostr, const unsigned char* string, size_t len, char quote, int
       xml_version, raptor_simple_message_handler error_handler, void*
       error_data)

       int raptor_iostream_write_xml_escaped_string(raptor_iostream* iostr,
       const unsigned char *string, size_t len, char quote,
       raptor_simple_message_handler error_handler, void *error_data)
              Write an XML-escaped version of the string given in (string,
              len) to iostream iostr.  If quote is given, the escaped content
              is for an XML attribute and the appropriate quote character is
              used, otherwise it is XML element content (CDATA).  The
              error_handler method along with error_data allow error reporting
              to be given.

              When an xml_version argument is present and has a value 10 (XML
              1.0) or 11 (XML 1.1) then that version is used.  The default
              with no argument is to generate XML 1.0.

       int raptor_xml_name_check(const unsigned char *string, size_t length,
       int xml_version)
              Check that the given string of length bytes is a legal XML name
              according to XML 1.0 or XML 1.1.  xml_version is set to 10 or 11
              respectively.  Returns non-zero if the name is legal.

MEMORY UTILITY FUNCTIONS
       void raptor_free_memory(void *ptr)
              Free memory allocated inside raptor.  Some systems require
              memory allocated in a library to be deallocated inside that
              library.  This function can be used in that situation to free
              memory allocated by raptor, such as the result of the _to_
              methods that return allocated memory such as
              raptor_uri_to_filename, raptor_uri_to_string,
              raptor_uri_to_relative_counted_uri_string,
              raptor_uri_to_relative_uri_string or
              raptor_new_namespace_parts_from_string.

       void* raptor_alloc_memory(size_t size)
              Allocate memory inside the raptor library.  Some systems require
              memory allocated in a library to be deallocated inside that
              library.  This function can be used in that situation to
              allocate memory for raptor to free later, such as inside the
              handler function declared with raptor_set_generate_id_handler
              which returns new memory.

       void* raptor_calloc_memory(size_t nmemb, size_t size)
              Allocate zeroed array of items inside raptor.  Some systems
              require memory allocated in a library to be deallocated inside
              that library.  This function can be used in that situation to
              clear an array of allocated memory for raptor to use, for
              freeing later, such as inside the handler function declared with
              raptor_set_generate_id_handler which returns new memory.

UNICODE UTILITY FUNCTIONS
       int raptor_unicode_char_to_utf8(raptor_unichar c, unsigned char
       *output)
              Turn a Unicode character into UTF8 bytes in output of size c
              bytes which must be of sufficient size.  Returns the number of
              bytes encoded or <0 on failure.

       int raptor_utf8_to_unicode_char(raptor_unichar *output, const unsigned
       char *input, int length)
              Decode a sequence UTF8 bytes in input of size length into a
              Unicode character in output returning the number of bytes used
              or <0 on failure.

       int raptor_utf8_check(const unsigned char *string, size_t length)
              Check that a given string is legal UTF-8 encoding and includes
              only legal Unicode characters U+0 to U+0x10ffff inclusive.
              Returns non-0 if the string is good.

       int raptor_unicode_is_xml11_namestartchar(raptor_unichar c)

       int raptor_unicode_is_xml10_namestartchar(raptor_unichar c)

       int raptor_unicode_is_xml11_namechar(raptor_unichar c)

       int raptor_unicode_is_xml10_namechar(raptor-unichar c)
              Check that given Unicode characters are allowed as XML 1.0 or
              XML 1.0 names - either as the starting character
              (*_namestartchar) or continuing character (*_namechar).  Returns
              non-0 if the character is allowed.

ERROR UTILITY FUNCTIONS
       void raptor_error_handlers_init(raptor_error_handlers* error_handlers)
              Initialise an error_handlers structure after the log level
              handlers and user data pointers have been set.

MISCELLANEOUS UTILITY FUNCTIONS
       char* raptor_vsnprintf(const char *message, va_list arguments)
              Compatibility wrapper around vsnprintf.

STATIC VARIABLES
       There are several read-only static variables in the raptor library:

       const char * const raptor_short_copyright_string
              Short copyright string, suitable for one line.

       const char * const raptor_copyright_string
              Full copyright over several lines including URLs.

       const char * const raptor_version_string
              The version as a string

       const unsigned int raptor_version_major
              The major version number as an integer.

       const unsigned int raptor_version_minor
              The minor version number as an integer.

       const unsigned int raptor_version_release
              The release version number as an integer.

       const unsigned int raptor_version_decimal
              The version number as a single decimal.

       const char * const raptor_license_string
              The license string over several lines including URLs.

       const char * const raptor_home_url_string
              The home page URL as a string.

SERIALIZER CLASS
       This class provides the functionality of turning RDF triples into
       syntaxes - RDF serializing.

SERIALIZER CONSTRUCTOR
       raptor_serializer* raptor_new_serializer(const char *name)
              Create a new raptor serializer object for the serializer with
              name name currently either "rdfxml" or "ntriples".  or "rss-1.0"
              for the RSS 1.0 serializer.

SERIALIZER DESTRUCTOR
       void raptor_free_serializer(raptor_serializer* rdf_serializer)
              Destroy a Raptor serializer object.

SERIALIZER SERIALIZING METHODS
       int raptor_serialize_start(raptor_serializer* rdf_serializer,
       raptor_uri *uri, raptor_iostream *iostream)
              Start to serialize content using the given iostream to write to
              with optional base URI uri. The iostream becomes owned by the
              serializer object and is destroyed at the end of serializing
              when raptor_serialize_end() is called.  Note that  some syntaxes
              may refuse to serialize without a base URI, such as RDF/XML.

       int raptor_serialize_start_to_iostream(raptor_serializer*
       rdf_serializer, raptor_uri* uri, raptor_iostream* iostream)
              Start to serialize content using the given iostream to write to
              with optional base URI uri.  The iostream does NOT become owned
              by the serializer object and the caller may continue to write to
              it after serializing is finished.  Note that some syntaxes may
              refuse to serialize without a base URI, such as RDF/XML.

       int raptor_serialize_start_to_filename(raptor_serializer*
       rdf_serializer, const char *filename)
              Start to serialize content to the file filename which is opened
              for writing. The base URI is calculated from the file name.

       int raptor_serialize_start_to_string(raptor_serializer* rdf_serializer,
       raptor_uri *uri, void **string_p, size_t *length_p)
              Start to serialize content to a string.  string_p must point to
              a void* pointer that will be used at the end of serializing to
              store the newly allocated string.  length_p if not NULL, it will
              be used to store the length of the new string.  The serializing
              is done with optional base URI uri however some syntaxes may
              refuse to serialize without a base URI, such as RDF/XML.

       int raptor_serialize_start_to_file_handle(raptor_serializer*
       rdf_serializer, raptor_uri *uri, FILE *handle)
              Start to serialize content to the already open C Standard I/O
              FILE* handle with the base URI uri, which is optional and may be
              NULL.  Note that some syntaxes may refuse to serialize without a
              base URI, such as RDF/XML.

       int raptor_serialize_statement(raptor_serializer* rdf_serializer, const
       raptor_statement *statement)
              Serialize a single statement using the serializer.

       int raptor_serialize_end(raptor_serializer* rdf_serializer)
              End the serializing.  This may close and delete resources used
              in serializing.  No more calls to raptor_serialize_statement or
              raptor_serialize_end may be done at this point.

       raptor_iostream* raptor_serializer_get_iostream(raptor_serializer
       *serializer)
              Return a pointer to the raptor_iostream* used by the serializer.

       int raptor_serializer_set_namespace(raptor_serializer* serializer,
       raptor_uri *uri, const char *prefix)
              Set a suggested namespace URI/prefix mapping for use in
              serializing.

SERIALIZER UTILITY METHODS
       void raptor_serializer_set_error_handler(raptor_serializer* serializer,
       void *user_data, raptor_message_handler handler)
              Set the serializer non-fatal error handler callback.

       void raptor_serializer_set_warning_handler(raptor_serializer*
       serializer, void *user_data, raptor_message_handler handler)
              Set the serializer warning message handler callback.

       raptor_locator* raptor_serializer_get_locator(raptor_serializer*
       rdf_serializer)
              Return the current raptor_locator object for the serializer.
              This is a public structure defined in raptor.h that can be used
              directly, or formatted via raptor_print_locator.

       int raptor_serializer_set_feature(raptor_serializer *serializer,
       raptor_feature feature, int value)
              Set a serializer feature feature to a particular value.  Returns
              non 0 on failure or if the feature is unknown.  The current
              defined serializer features are:
                Feature                                 Values
                RAPTOR_FEATURE_RELATIVE_URIS            Boolean (non 0 true)
                RAPTOR_FEATURE_WRITE_BASE_URI           Boolean (non 0 true)
                RAPTOR_FEATURE_START_URI                URI String
                RAPTOR_FEATURE_BNODE_BORDER             String
                RAPTOR_FEATURE_BNODE_FILL               String
                RAPTOR_FEATURE_JSON_CALLBACK            String
                RAPTOR_FEATURE_JSON_EXTRA_DATA          String
                RAPTOR_FEATURE_LITERAL_BORDER           String
                RAPTOR_FEATURE_LITERAL_FILL             String
                RAPTOR_FEATURE_RESOURCE_BORDER          String
                RAPTOR_FEATURE_RESOURCE_FILL            String
                RAPTOR_FEATURE_RSS_TRIPLES              String
                RAPTOR_FEATURE_ATOM_ENTRY_URI           String


       If the relative_uris feature is true (default false) then when
       serialising, preference is given to generating relative URIs where
       possible.

       If the write_base_uri feature is true (default true) then the atom,
       rdfxml, rdfxml-abbrev and turtle serializers will write an @base or
       xml:base directive in the output.

       If the start_uri feature is set to a URI it is used by the serializer
       to start serializing from.

       If the bnode_border feature is set, the DOT serializer uses it as the
       bnode border colour.

       If the bnode_fill feature is set, the DOT serializer uses it as the
       bnode fill colour.

       If the json_callback feature is set, the JSON serializers use it as the
       name of the callback to wrap the outer JSON object.

       If the json_extra_data feature is set, the JSON serializers use it as
       extra data inside the outer JSON object.

       If the literal_border feature is set, the DOT serializer uses it as the
       literal border colour.

       If the literal_fill feature is set, the DOT serializer uses it as the
       literal fill colour.

       If the resource_border feature is set, the DOT serializer uses it as
       the resource border colour.

       If the resource_fill feature is set, the DOT serializer uses it as the
       resource fill colour.

       If the rss_triples feature is set to the string "rdf-xml" for the
       rss-1.0 serializer or "atom-triples" for the atom serializer, it writes
       extra rdf triples into the serialized output.

       If the atom_entry_uri feature is set to a URI string, it is used to
       trigger generation of an atom entry document for the atom serializer.

       int raptor_serializer_get_feature(raptor_serializer* serializer,
       raptor_feature feature)
              Get serializer features, the allowed feature values are
              available

       raptor_world* raptor_serializer_get_world(raptor_serializer*
       rdf_serializer)
              Get the world object for the given rdf_serializer.

SERIALIZER UTILITY FUNCTIONS
       int raptor_serializers_enumerate(const unsigned int counter, const char
       **name, const char **label, const char **mime_type, const unsigned char
       **uri_string)
              Return the serializer name/label for a serializer with a given
              integer counter, returning non-zero if no such parser at that
              offset exists.  The counter should start from 0 and be
              incremented by 1 until the function returns non-zero.

       int raptor_serializer_syntax_name_check(const char *name)
              Check name is a known serializer syntax name.

URI CLASS
       Raptor has a raptor_uri class must be used for manipulating and passing
       URI references.  The default internal implementation uses char* strings
       for URIs, manipulating them and constructing them.  This URI
       implementation can be replaced by any other that provides the
       equivalent functionality, using the raptor_uri_set_handler function.

URI CONSTRUCTORS
       There a several constructors for raptor_uri to build them from char*
       strings and existing raptor_uri objects.

       raptor_uri* raptor_new_uri(const unsigned char* uri_string)
              Create a raptor URI from a string URI-reference uri_string.

       raptor_uri* raptor_new_uri_from_uri_local_name(raptor_uri* uri, const
       unsigned char* local_name)
              Create a raptor URI from a string URI-reference local_name
              relative to an existing URI-reference.  This performs
              concatenation of the local_name to the uri and not relative URI
              resolution, which is done by the raptor_new_uri_relative_to_base
              constructor.

       raptor_uri* raptor_new_uri_relative_to_base(raptor_uri* base_uri, const
       unsigned char* uri_string)
              Create a raptor URI from a string URI-reference uri_string using
              relative URI resolution to the base_uri.

       raptor_uri* raptor_new_uri_from_id(raptor_uri* base_uri, const unsigned
       char* id)
              Create a raptor URI from a string RDF ID id concatenated to the
              base_uri base URI.

       raptor_uri* raptor_new_uri_for_rdf_concept(const char* name)
              Create a raptor URI for the RDF namespace concept name.

       raptor_uri* raptor_new_uri_for_xmlbase(raptor_uri* old_uri))
              Create a raptor URI suitable for use with xml:base (throw away
              fragment)

URI DESTRUCTOR
       void raptor_free_uri(raptor_uri* uri)
              Destroy a raptor URI object.

URI METHODS
       int raptor_uri_equals(raptor_uri* uri1, raptor_uri* uri2)
              Return non-zero if the given URIs are equal.

       raptor_uri* raptor_uri_copy(raptor_uri* uri)
              Return a copy of the given raptor URI uri.

       unsigned char* raptor_uri_as_counted_string(raptor_uri *uri, size_t*
       len_p)

       unsigned char* raptor_uri_as_string(raptor_uri* uri)
              Return a shared pointer to a string representation of the given
              raptor URI uri.  This string is shared and must not be freed
              (otherwise see the raptor_uri_to_* methods below).  If
              raptor_uri_as_counted_string is used, the length of the returned
              string is stored in *len_p if not NULL.

       unsigned char* raptor_uri_to_counted_string(raptor_uri *uri, size_t
       *len_p)

       unsigned char* raptor_uri_to_string(raptor_uri *uri)
              Return a to a newly alloced string representation of the given
              raptor URI uri.  This string must be freed by the caller using
              raptor_free_memory.  If raptor_uri_to_counted_string is used,
              the length of the returned string is stored in *len_p if not
              NULL.

       unsigned char* raptor_uri_to_relative_counted_uri_string(raptor_uri
       *base_uri, raptor_uri *reference_uri, size_t *length_p)

       unsigned char* raptor_uri_to_relative_uri_string(raptor_uri *base_uri,
       raptor_uri *reference_uri)
              Return a new relative URI string of a URI reference_uri against
              a base URI base_uri.  The returned string must be freed with
              raptor_free_memory.  If raptor_uri_to_relative_counted_string is
              used, the length of the returned string is stored in *len_p if
              not NULL.

       void raptor_uri_print(const raptor_uri* uri, FILE *stream)
              Print URI uri to the file handle stream.

       int raptor_iostream_write_uri(raptor_iostream* iostr,  raptor_uri* uri)
              Write the raptor_uri uri to the iostream ostr.

URI UTILITY FUNCTIONS
       void raptor_uri_resolve_uri_reference (const unsigned char* base_uri,
       const unsigned char* reference_uri, char unsigned* buffer, size_t
       length)
              This is a standalone function that resolves the relative URI
              reference_uri against the base URI base_uri according to the URI
              resolution rules in RFC2396.  The resulting URI is stored in
              buffer which is of length bytes.  If this is too small, no work
              will be done.

       char *raptor_uri_filename_to_uri_string(const unsigned char* filename)
              This is a standalone function that turns a local filename
              (Windows or Unix style as appropriate for platform) into a URI
              string (file).
               The returned string must be freed by the caller. Some systems
              require memory allocated in a library to be deallocated inside
              that library in which case raptor_free_memory may be used.

       char *raptor_uri_uri_string_to_filename(const unsigned char*
       uri_string)

       char *raptor_uri_uri_string_to_filename(const unsigned char*
       uri_string, unsigned char **fragment_p)
              These are standalone functions that turn a URI string that
              represents a local filename (file:) into a filename, with
              optional URI fragment.  If fragment_p is not NULL it points to
              the location to store a newly allocated string containing the
              fragment.  The returned strings must be freed by the caller.
              Some systems require memory allocated in a library to be
              deallocated inside that library in which case raptor_free_memory
              may be used.

       int raptor_uri_is_file_uri(const unsigned char* uri_string)
              DEPRECATED in 1.4.9.  Returns non-zero if the given URI string
              represents a filename.  Use raptor_uri_uri_string_is_file_uri in
              preference.

       int raptor_uri_uri_string_is_file_uri(const unsigned char* uri_string)
              Returns non-zero if the given URI string represents a filename.

URI CLASS IMPLEMENTATION
       void raptor_uri_set_handler(const raptor_uri_handler *handler, void
       *context)
              Change the URI class implementation to the functions provided by
              the handler URI implementation.  The context user data is passed
              in to the handler URI implementation calls.

       void raptor_uri_get_handler(raptor_uri_handler **handler, void
       **context)
              Return the current raptor URI class implementation handler and
              context


WWW CLASS
       This is a small wrapper class around existing WWW libraries in order to
       provide HTTP GET or better URI retrieval for Raptor.  It is not
       intended to be a general purpose WWW retrieval interface.

WWW CLASS INITIALISATION AND CLEANUP
       void raptor_www_init(void)

       void raptor_www_finish(void)
              Initialise or terminate the raptor_www infrastructure.
              raptor_www_init and raptor_finish are called by raptor_init and
              raptor_finish respecitively, otherwise must be called once each.

       NOTE   Several of the WWW library implementations require once-only
              initialisation and termination functions to be called, however
              raptor cannot determine whether this is already done before the
              library is initialised in raptor_www_init or terminated in
              raptor_www_finish, so always performs it.  This can be changed
              by raptor_www_no_www_library_init_finish.

       void raptor_www_no_www_library_init_finish(void)
              If this is called before raptor_www_init, it will not call the
              underlying WWW library global initialise or terminate functions.
              The application code must perform both operations.

              For example with curl, after this function is called, neither
              curl_global_init nor curl_global_cleanup will be called during
              raptor_www_init or raptor_www_finish respectively.

WWW CONSTRUCTORS
       raptor_www *raptor_www_new(void)

       raptor_www *raptor_www_new_with_connection(void* connection)
              Create a raptor WWW object capable of URI retrieval.  If
              connection is given, it must match the connection object of the
              underlying WWW implementation.  At present, this is only for
              libcurl, and allows you to re-use an existing curl handle, or
              use one which has been set up with some desired qualities.

WWW DESTRUCTOR
       void raptor_www_free(raptor_www *www)
              Destroy a raptor WWW object.

WWW METHODS
       void raptor_www_set_user_agent(raptor_www *www, const char *user_agent)
              Set the HTTP User-Agent header value.

       int raptor_www_set_http_cache_control(raptor_www* www, const char*
       cache_control)
              Set the HTTP Cache-Control header value.

       void raptor_www_set_proxy(raptor_www *www, const char *proxy)
              Set the HTTP proxy - usually a string of the form
              http://server:port

       raptor_www_set_write_bytes_handler(raptor_www *www,
       raptor_www_write_bytes_handler handler, void *user_data)
              Set the handler to receive bytes written by the raptor_www
              implementation.

       void raptor_www_set_content_type_handler(raptor_www *www,
       raptor_www_content_type_handler handler, void *user_data)
              Set the handler to receive the HTTP Content-Type value, when/if
              discovered during retrieval by the raptor_www implementation.

       void raptor_www_set_http_accept(raptor_www *www, const char *value)
              Set the WWW HTTP Accept: header to value.  If value is NULL, an
              empty header is sent.

       void raptor_www_set_error_handler(raptor_www *www,
       raptor_message_handler error_handler, void *error_data)
              Set the error handler routine for the raptor_www class.  This
              takes the same arguments as the raptor_parser error, warning
              handler methods.

       void raptor_www_set_uri_filter(raptor_www* www, raptor_uri_filter_func
       filter, void* user_data)
              Set the URI filter function filter for URIs retrieved by the
              raptor_www object.

       void* raptor_www_get_connection(raptor_www *www)
              Return the underlying WWW library connection object.  For
              example, for libcurl this is the curl_handle.

       void raptor_www_set_connection_timeout(raptor_www* www, int timeout)
              Set the WWW connection timeout in seconds.

       raptor_uri* raptor_www_get_final_uri(raptor_www* www)
              Get the final URI from a WWW retrieval, which may include
              redirections.

WWW ACTION METHODS
       int raptor_www_fetch(raptor_www *www, raptor_uri *uri)
              Retrieve the given URL, returning non zero on failure.

       int raptor_www_fetch_to_string(raptor_www *www, raptor_uri *uri, void
       **string_p, size_t *length_p, void *(*malloc_handler)(size_t size))
              Retrieve the given URL to a string.  string_p must point to a
              void* pointer that will be used to store the newly allocated
              string.  length_p if not NULL, it will be used to store the
              length of the new string.

       void raptor_www_abort(raptor_www *www, const char *reason)
              Abort an ongoing raptor WWW operation. Typically used within one
              of the raptor WWW handlers.

QNAME CLASS
       This is a class for handling XML QNames consisting of the pair of (a
       URI from a namespace, a local name) along with an optional value --
       useful for XML attributes.  This is used with the
       raptor_namespace_stack and raptor_namespace classes to handle a stack
       of raptor_namespace that build on raptor_qname.

QNAME CONSTRUCTORS
       There are two constructors for raptor_qname to build qnames with
       optional values on a stack of names.

       raptor_qname* raptor_new_qname(raptor_namespace_stack *nstack, const
       unsigned char *name, const unsigned char *value,
       raptor_simple_message_handler error_handler, void *error_data)
              Create a raptor QName name (a possibly :-separated name) with
              name to be resolved against the given nstack namespace stack.
              An optional value can be given, and if there is an error, the
              error_handler and error_data will be used to invoke the
              callback.

       raptor_qname* raptor_new_qname_from_namespace_local_name
       (raptor_namespace *ns, const unsigned char *local_name, const unsigned
       char *value)
              Create a raptor QName using the namespace name of the
              raptor_namespace ns and the local name local_name, along with
              optional value value.  Errors are reported using the error
              handling and data of the namespace.

       raptor_qname* raptor_qname_copy(raptor_qname *qname)
              Create a raptor QName from an existing one, returning NULL on
              failure.

QNAME DESTRUCTOR
       void raptor_free_qname(raptor_qname* name)
              Destroy a raptor qname object.

QNAME METHODS
       int raptor_qname_equal(raptor_qname* name1, raptor_qname *name2)
              Return non-zero if the given QNames are equal.

       int raptor_iostream_write_qname(raptor_iostream* iostr, raptor_qname
       *qname)
              Write the raptor_qname qname to the iostream ostr.

       const unsigned char* raptor_qname_get_local_name(raptor_qname* name)
              Get the local name of the QName.

       const unsigned char* raptor_qname_get_value(raptor_qname* name)
              Get the value of the QName for an XML attribute QName.

       const unsigned char* raptor_qname_get_counted_value(raptor_qname* name,
       size_t* length_p)
              Get the value fo the QName along with the length (if length_p is
              not NULL) for an XML attribute QName.

       unsigned char* raptor_qname_to_counted_name(raptor_qname* qname,
       size_t* length_p)
              Get the formatted QName as a newly allocated counted string (if
              length_p is not NULL).

QNAME UTILITY FUNCTIONS
       raptor_uri* raptor_qname_string_to_uri(raptor_namespace_stack *nstack,
       const unsigned char *name, size_t name_len,
       raptor_simple_message_handler error_handler, void *error_data)
              Return the URI corresponding to the QName according to the RDF
              method; concatenating the namespace's name (URI) with the local
              name.  Takes the same arguments as raptor_new_qname but does not
              create a raptor_qname object.

       raptor_namespace* raptor_qname_get_namespace(raptor_qname* name)
              Return the raptor_namespace used by the QName.  Will never be
              NULL even for the default namespace in which case the URI of the
              returned namespace object will be NULL.

NAMESPACE CLASS
       An XML namespace class - each entry is on a stack and consists of a
       name (URI) and prefix.  The prefix or the name but not both may be
       empty.  If the prefix is empty, it defines the default prefix.  If the
       name is empty, it undefines the given prefix.

NAMESPACE CONSTRUCTORS
       raptor_namespace* raptor_new_namespace(raptor_namespace_stack *nstack,
       const unsigned char *prefix, const unsigned char *ns_uri_string, int
       depth)

       raptor_namespace* raptor_new_namespace_from_uri(raptor_namespace_stack
       *nstack, const unsigned char *prefix, raptor_uri* ns_uri, int depth)
              Create a new raptor_namespace object on the given namespace
              stack nstack with prefix prefix and namespace name either from
              URI string ns_uri_string or from copying URI ns_uri.

       If prefix is NULL, it defines the URI for the default namespace prefix.
       If the namespace name (ns_uri_string or ns_uri) is NULL, it undefines
       the given prefix in the current scope.  Both prefix and URI may be NULL
       to undefine the default namespace.  depth signifies the position of the
       namespace on the stack; 0 is the bottom of the stack and generally the
       first depth for user namespace declarations.

       Namespaces declared on the same depth (such as on the same XML element,
       typically) can be handily freed with raptor_namespaces_end_for_depth
       method on the namespace stack class.

NAMESPACE DESTRUCTOR
       void raptor_free_namespace(raptor_namespace *ns)
              Destroy a raptor namespace object.

NAMESPACE METHODS
       raptor_uri* raptor_namespace_get_uri(const raptor_namespace *ns)
              Return the namespace name (URI) of the namespace.

       const unsigned char* raptor_namespace_get_prefix(const raptor_namespace
       *ns)
              Return the prefix of the namespace.

       const unsigned char* raptor_namespace_get_counted_prefix(const
       raptor_namespace* ns, size_t* length_p)
              Return the prefix of the namespace as a string with optional
              count stored in the variable address length_p if it is not NULL.

       unsigned char *raptor_namespaces_format(const raptor_namespace *ns,
       size_t *length_p)
              Format the namespace as a string and return it as a new string,
              returning the length of the resulting string in length_p if it
              is not NULL.  The string format is suitable for emitting in XML
              to declare the namespace.

       int raptor_iostream_write_namespace(raptor_iostream* iostr,
       raptor_namespace *ns)
              Write a formatted namespace declaration like xmlns... to an
              iostream iostr.

NAMESPACE UTILITY FUNCTIONS
       int raptor_namespace_copy(raptor_namespace_stack *nstack,
       raptor_namespace *ns, int new_depth)
              Copy the namespace from the current stack to the new one, nstack
              at depth new_depth.

       int raptor_new_namespace_parts_from_string(unsigned char *string,
       unsigned char **prefix, unsigned char **uri_string)
              Parse string with an XML-style namespace declaration like
              xmlns="", xmlns="uri", xmlns:prefix="" or xmlns:prefix="uri"
              into the strings pointed to by prefix string and a uri_string.
              Empty prefixes or namespace names return NULL pointers.
              Returned strings must be freed by the caller using
              raptor_free_memory.

NAMESPACE STACK CLASS
       A stack of raptor_namespace objects where the namespaces on top of the
       stack have wider scope and override earlier (lower) namespace
       declarations.  Intended to match the XML namespace declaring semantics
       using xmlns attributes.

NAMESPACE STACK CONSTRUCTORS
       raptor_namespace_stack* raptor_new_namespaces(raptor_uri_handler
       *uri_handler, void *uri_context, raptor_simple_message_handler
       error_handler, void *error_data, int defaults)

       int raptor_namespaces_init(raptor_namespace_stack *nstack,
       raptor_uri_handler *handler, void *context,
       raptor_simple_message_handler error_handler, void *error_data, int
       defaults)
              Create or initialise a new raptor_namespace_stack object with
              the given URI and error handlers.  raptor_namespaces_new
              allocates new memory for the namespace stack and
              raptor_namespaces_init initialises an existing declared nstack,
              which could be statically allocated.  Note that
              raptor_uri_get_handler can be useful to return the current
              raptor URI handler/context.  The defaults argument describes
              which default namespaces are declared in the empty stack.  At
              present, 0 is none, 1 for just the XML namespace and 2 is for a
              typical set of namespaces used for RDF, RDFS, Dublin Core, OWL,
              ...  that may vary over time.

              In versions 1.4.16 or newer this returns an integer result,
              non-0 on failure.

NAMESPACE STACK DESTRUCTORS
       void raptor_free_namespaces(raptor_namespace_stack *nstack)
              Destroy a namespace stack object, freeing the nstack (goes with
              raptor_new_namespaces).

       void raptor_namespaces_clear(raptor_namespace_stack *nstack)
              Clear a statically allocated namespace stack; does not free the
              nstack.  (goes with raptor_namespaces_init).

NAMESPACE STACK METHODS
       void raptor_namespaces_start_namespace(raptor_namespace_stack *nstack,
       raptor_namespace *nspace)
              Start the given nspace on the stack, at the depth already
              defined.

       int raptor_namespaces_start_namespace_full(raptor_namespace_stack
       *nstack, const unsigned char *prefix, const unsigned char *nspace, int
       depth)
              Create a new raptor_namespace and start it on the stack.  See
              raptor_new_namespace for the meaning of the argumens.

       void raptor_namespaces_end_for_depth(raptor_namespace_stack *nstack,
       int depth)
              End (and free) all namespaces on the stack at the given depth.

       raptor_namespace* raptor_namespaces_get_default_namespace
       (raptor_namespace_stack *nstack)
              Return the current default raptor_namespace of the namespace
              stack or NULL if there is none.

       raptor_namespace*
       raptor_namespaces_find_namespace_by_uri(raptor_namespace_stack *nstack,
       raptor_uri *ns_uri)
              Find the first namespace on the stack with the given uri ns_uri
              or NULL if there is none.

       raptor_namespace
       *raptor_namespaces_find_namespace_by_uri(raptor_namespace_stack
       *nstack, const unsigned char *prefix, int prefix_length)
              Find the first namespace on the stack with the given namespace
              prefix or NULL if there is none.

       int raptor_namespaces_namespace_in_scope(raptor_namespace_stack
       *nstack, const raptor_namespace *nspace)
              Return non-zero if the raptor_namespace nspace is declared on
              the stack; i.e. in scope if this is a stack of XML namespaces.

NAMESPACE STACK UTILITY FUNCTIONS
       raptor_qname* raptor_namespaces_qname_from_uri(raptor_namespace_stack*
       nstack,  raptor_uri* uri, int xml_version)
              Create a raptor QName from the URI uri if the URI is squal one
              of the namespace URIs on the namespace stack nstack URIs
              concatenated to a legal XML name for the given XML version.
              URIs are created and errors are reported using the namespace
              stack fields.  Fails if it cannot be legally described with any
              of the namespaces.

SEQUENCE CLASS
       A class for ordered sequences of items, adding at either end of the
       sequence.  The method names should be familiar to Perl users.

SEQUENCE CONSTRUCTOR
       raptor_sequence* raptor_new_sequence(raptor_sequence_free_handler*
       free_handler, raptor_sequence_print_handler* print_handler)
              Create a new empty sequence, with optional handler for freeing
              elements (as used by raptor_free_sequence and printing out
              elements (used by raptor_sequence_print).

SEQUENCE DESTRUCTOR
       void raptor_free_sequence(raptor_sequence* seq)
              Destoy a sequence object, freeing any items if the free handler
              was defined in the constructor.

SEQUENCE METHODS
       int raptor_sequence_size(raptor_sequence* seq)
              Return the number of items in the sequence.

       int raptor_sequence_set_at(raptor_sequence* seq, int idx, void *data)
              Set the sequence item at index idx to the value data, extending
              it if necessary.

       int raptor_sequence_push(raptor_sequence* seq, void *data)
              Add item data to the end of the sequence.

       int raptor_sequence_shift(raptor_sequence* seq, void *data)
              Add item data to the start of the sequence.

       void* raptor_sequence_get_at(raptor_sequence* seq, int idx)
              Get the sequence item at index idx or NULL if no such index
              exists.

       void* raptor_sequence_pop(raptor_sequence* seq)
              Remove and return an item from the end of the sequence, or NULL
              if is empty.

       void* raptor_sequence_unshift(raptor_sequence* seq)
              Remove and return an item from the start of the sequence, or
              NULL if is empty.

       void raptor_sequence_sort(raptor_sequence* seq, int(*compare)(const
       void *, const void *))
              Sort the sequence using the given comparison function compare
              which is passed to qsort(3) internally.

       int raptor_compare_strings(const void *a, const void *b)
              Helper function useful with raptor_sequence_sort.

       void raptor_sequence_set_print_handler(raptor_sequence *seq,
       raptor_sequence_print_handler *print_handler)
              Set the print handler for the sequence, an alternative to
              setting it in the constructor.

       void raptor_sequence_print_string(char *data, FILE *fh)
              Helper print handler function useful for printing out sequences
              of strings.

       void raptor_sequence_print_uri(char *data, FILE *fh)
              Helper print handler function useful for printing out sequences
              of raptor_uri* objects.

       void raptor_sequence_print(raptor_sequence* seq, FILE* fh)
              Print out the sequence in a debug format to the given file
              handler fh.  NOTE: The exact format is not guaranteed to remain
              the same between releases.

       int raptor_sequence_join(raptor_sequence* dest, raptor_sequence *src)
              Join two sequences moving all items from sequence src to the end
              of sequence dest.  After this operation, sequence src will be
              empty (zero size) but will have the same item capacity as
              before.

       void* raptor_sequence_delete_at(raptor_sequence* seq, int idx)
              Remove an item from position idx in the sequence, returning it.

STRINGBUFFER CLASS
       A class for growing strings, small chunks at a time.

STRINGBUFFER CONSTRUCTOR
       raptor_stringbuffer* raptor_new_stringbuffer(void)
              Create a new stringbuffer.

STRINGBUFFER DESTRUCTOR
       void raptor_free_stringbuffer(raptor_stringbuffer* stringbuffer)
              Destroy a stringbuffer.

STRINGBUFFER METHODS
       int raptor_stringbuffer_append_counted_string(raptor_stringbuffer*
       stringbuffer, const unsigned char *string, size_t length, int do_copy)
              Append a string of length bytes to a stringbuffer, copying it
              only if do_copy is non-0.

       int raptor_stringbuffer_append_string(raptor_stringbuffer*
       stringbuffer, const unsigned char* string, int do_copy)
              Append a string to a stringbuffer, copying it only if do_copy is
              non-0.

       int raptor_stringbuffer_append_decimal(raptor_stringbuffer*
       stringbuffer, int integer)
              Append a formatted decimal integer to a stringbuffer.

       int raptor_stringbuffer_append_stringbuffer(raptor_stringbuffer*
       stringbuffer, raptor_stringbuffer* append)
              Append a stringbuffer append to a stringbuffer.  The append
              stringbuffer is emptied but not destroyed.

       int raptor_stringbuffer_prepend_counted_string(raptor_stringbuffer*
       stringbuffer, const unsigned char* string, size_t length, int do_copy)
              Prepend a string of length bytes to the start of a stringbuffer,
              copying it only if do_copy is non-0.

       int raptor_stringbuffer_prepend_string(raptor_stringbuffer*
       stringbuffer, const unsigned char* string, int do_copy)
              Prepend a string to the start of a stringbuffer, copying it only
              if do_copy is non-0.

       unsigned char * raptor_stringbuffer_as_string(raptor_stringbuffer*
       stringbuffer)
              Return the stringbuffer as a single string.  The string is
              shared and should be copied if needed.

       size_t raptor_stringbuffer_length(raptor_stringbuffer* stringbuffer)
              Return the length of the stringbuffer.

       int raptor_stringbuffer_copy_to_string(raptor_stringbuffer*
       stringbuffer, unsigned char *string, size_t length)
              Copy the stringbuffer into a single string buffer string of size
              length.  Returns non-0 on failure.

IOSTREAM CLASS
       This class provides an I/O stream that can write to filenames, FILE*,
       strings and user-defined output via callbacks.

IOSTREAM CONSTRUCTOR
       raptor_iostream* raptor_new_iostream_from_handler2(void* context, const
       raptor_iostream_handler2 *handler)
              Create a new raptor read or write iostream from a user-defined
              raptor_iostream_handler2 handler that is called with the passed-
              in context for the write operations.

       raptor_iostream* raptor_new_iostream_from_handler(void* context, const
       raptor_iostream_handler *handler)
              DEPRECATED in 1.4.17 - use raptor_new_iostream_from_handler2()
              with the new handler format.  Create a new raptor read iostream
              from a user-defined raptor_iostream_handler handler that is
              called with the passed-in context for the write operations.

       raptor_iostream* raptor_new_iostream_to_sink(void)
              Create a new raptor write iostream that discards all written
              output.

       raptor_iostream* raptor_new_iostream_to_filename(const char *filename)
              Create a new raptor write iostream that creates and writes to a
              new file filename.

       raptor_iostream* raptor_new_iostream_to_file_handle(FILE *handle)
              Create a new raptor write iostream that creates and writes to an
              existing, already opened, C Standard I/O handle FILE* handle.

       raptor_iostream* raptor_new_iostream_to_string(void **string_p, size_t
       *length_p, void *(*malloc_handler)(size_t size))
              Create a new raptor write iostream which creates a new string
              once raptor_free_iostream is called.  The new string pointer is
              written in string, the length in length_p (if not NULL) and the
              memory allocation is made using the malloc_handler, or if NULL,
              raptor's default memory allocator.

       raptor_iostream* raptor_new_iostream_from_sink(void)
              Create a new raptor read iostream that is immediately finished
              and returns end of file.

       raptor_iostream* raptor_new_iostream_from_filename(const char
       *filename)
              Create a new raptor read iostream from an existing file
              filename.

       raptor_iostream* raptor_new_iostream_from_file_handle(FILE *handle)
              Create a new raptor read iostream from an already opened, C
              Standard I/O handle FILE* handler.

       raptor_iostream* raptor_new_iostream_from_string(void *string, size_t
       length)
              Create a new raptor read iostream reading from an existing
              string of length bytes.

IOSTREAM DESTRUCTOR
       void raptor_free_iostream(raptor_iostream *iostr)
              Destroy a Raptor iostream object.

IOSTREAM METHODS
       int raptor_iostream_write_bytes(raptor_iostream *iostr, const void
       *ptr, size_t size, size_t nmemb)
              Write a counted set of elements to an iostream. Inmemb is the
              count of elements of size size, starting at memory ptr.  Similar
              to fwrite(3) and write(2).

       int raptor_iostream_write_byte(raptor_iostream *iostr, const int byte)
              Write a single byte an iostream.  Similar to fputc(3).

       void raptor_iostream_write_end(raptor_iostream *iostr)
              Finish writing to an iostream.

       int raptor_iostream_write_string(raptor_iostream *iostr, const void
       *string)
              Write a NUL-terminated string to an iostream.  Similar to
              fputs(3).

       int raptor_iostream_write_counted_string(raptor_iostream *iostr, const
       void *string, size_t len)
              Write a string of length len to an iostream.

       unsigned long raptor_iostream_tell(raptor_iostream *iostr)
              Return the byte offset into the iostream.

       size_t raptor_iostream_get_bytes_written_count(raptor_iostream *iostr)
              DEPRECATED in 1.4.17 for raptor_iostream_tell().  Return the
              number of bytes written so far to the iostream.

       int raptor_iostream_write_decimal(raptor_iostream *iostr, int integer)
              Write a decimal formatted integer integer to the iostream.

       int raptor_iostream_format_hexadecimal(raptor_iostream *iostr, unsigned
       int integer, int width)
              Write a hexadecimal formatted unsigned integer to the iostream,
              left-padded with '0's to width columns.

       int raptor_iostream_write_stringbuffer(raptor_iostream* iostr,
       raptor_stringbuffer *sb)
              Write the stringbuffer to an iostream iostr.

       int raptor_iostream_read_bytes(raptor_iostream* iostr, void *ptr,
       size_t size, size_t nmemb)
              Read bytes from the iostream into buffer ptr up to nmemb
              elements of size size.

       int raptor_iostream_read_eof(raptor_iostream *iostr)
              Return non-0 if the iostream is finished.

XML SAX2 READER CLASS
       This class provides the functionality to generate SAX2 events from
       parsing XML content, including XML namespace support.

XML SAX2 CONSTRUCTOR
       raptor_sax2* raptor_new_sax2(void *user_data, raptor_error_handlers*
       error_handlers)
              Create a new SAX2 XML reader with the given error handler
              object.

XML WRITER DESTRUCTOR
       void raptor_free_sax2(raptor_sax2 *sax2)
              Destroy a SAX2 XML reader object.

SAX2 SET HANDLER METHODS
       void raptor_sax2_set_start_element_handler(raptor_sax2 *sax2,
       raptor_sax2_start_element_handler handler)
              Set the SAX2 start element handler.

       void raptor_sax2_set_end_element_handler(raptor_sax2 *sax2,
       raptor_sax2_end_element_handler handler)
              Set the SAX2 end element handler.

       void raptor_sax2_set_characters_handler(raptor_sax2 *sax2,
       raptor_sax2_characters_handler handler)
              Set the SAX2 character data element handler.

       void raptor_sax2_set_cdata_handler(raptor_sax2 *sax2,
       raptor_sax2_cdata_handler handler)
              Set the SAX2 CDATA section element handler.

       void raptor_sax2_set_comment_handler(raptor_sax2 *sax2,
       raptor_sax2_comment_handler handler)
              Set the SAX2 XML comment handler.

       void raptor_sax2_set_unparsed_entity_decl_handler(raptor_sax2 *sax2,
       raptor_sax2_unparsed_entity_decl_handler handler)
              Set the SAX2 XML unparsed entity declaration handler.

       void raptor_sax2_set_external_entity_ref_handler(raptor_sax2 *sax2,
       raptor_sax2_external_entity_ref_handler handler)
              Set the SAX2 XML external entity reference handler.

       void raptor_sax2_set_namespace_handler(raptor_sax2 *sax2,
       raptor_namespace_handler handler)
              Set the SAX2 XML namespace declaration handler when an XML
              namespace is declared.

SAX2 PARSING METHODS
       void raptor_sax2_parse_start(raptor_sax2 *sax2, raptor_uri *base_uri)
              Start a SAX2 parse of XML content with the base URI uri.

       int raptor_sax2_parse_chunk(raptor_sax2 *sax2, const unsigned char
       *buffer, size_t len, int is_end)
              Parse the XML content in buffer of size len returning SAX2
              events via handlers.  If is_end is non-zero, it indicates the
              end of the parsing.  This method can only be called after
              raptor_sax2_parse_start().

SAX2 SCOPE METHODS
       const unsigned char* raptor_sax2_inscope_xml_language(raptor_sax2
       *sax2)
              Get the current in-scope XML language (xml:lang) value.

       raptor_uri* raptor_sax2_inscope_base_uri(raptor_sax2 *sax2)
              Get the current in-scope Base URI (xml:base or document or
              protocol) value.

XML ELEMENT CLASS
       This class provides an XML element that can be used with the XML Writer
       Class to generate XML documents.

XML ELEMENT CONSTRUCTORS
       raptor_xml_element* raptor_new_xml_element(raptor_qname* name, const
       unsigned char* xml_language, raptor_uri* xml_base)
              Create a new XML element with the element name name in the
              context of xml:lang xml_language and base URI xml_base.

       raptor_xml_element*
       raptor_new_xml_element_from_namespace_local_name(raptor_namespace *ns,
       const unsigned char *name, const unsigned char* xml_language,
       raptor_uri* xml_base
              Create a new XML element based on the given XML namespace and
              localname in the context of xml:lang xml_language and base URI
              xml_base.

XML ELEMENT DESTRUCTOR
       void raptor_free_xml_element(raptor_xml_element *element)
              Destroy a XML element object.

XML ELEMENT METHODS
       raptor_qname* raptor_xml_element_get_name(raptor_xml_element*
       xml_element)
              Get the XML element QName of XML element xml_element.

       void raptor_xml_element_set_attributes(raptor_xml_element* xml_element,
       raptor_qname **attributes, int count)
              Set the attributes on XML element xml_element to the array of
              QNames in array attributes of size count.

       raptor_qname** raptor_xml_element_get_attributes(raptor_xml_element*
       xml_element)
              Get the attributes of an XML element xml_element as an array of
              QNames.  As set by void raptor_xml_element_set_attributes.

       int raptor_xml_element_get_attributes_count(raptor_xml_element*
       xml_element)
              Get the number of attributes of an XML element xml_element as
              set by void raptor_xml_element_set_attributes.

       int raptor_xml_element_declare_namespace(raptor_xml_element*
       xml_element, raptor_namespace* nspace)
              Declare an XML namespace nspace expliclitly on XML element
              xml_element.  Namespaces used in the element or attribute names
              are automatically declared, this method allows additional ones
              to be done.

       int raptor_xml_element_is_empty(raptor_xml_element* xml_element)
              Return non-0 if the XML element is empty.

       int raptor_iostream_write_xml_element(raptor_iostream* iostr,
       raptor_xml_element *element, raptor_namespace_stack* nstack, int
       is_empty, int is_end, raptor_simple_message_handler error_handler,
       void* error_data, int depth)
              Write a XML element xml_element to iostream ostr.  This is done
              in context of an XML namespace stack nstack and at depth depth
              in the stack (see Namespace class constructors).

              The element may be an empty element if is_empty is non-zero or
              may be a close element if is_end is non-zero (else is a start
              element).  The error_handler method along with error_data allow
              error reporting to be given.

       const unsigned char*
       raptor_xml_element_get_language(raptor_xml_element* xml_element)
              Get the xml:lang language of the XML element.

XML WRITER CLASS
       This class provides the functionality to generate simple XML documents
       consisting of elements with attributes, character data and comments.
       The documents can be written to an iostream.

XML WRITER CONSTRUCTOR
       raptor_xml_writer* raptor_new_xml_writer(raptor_namespace_stack*
       nstack, raptor_uri_handler* uri_handler, void* uri_context,
       raptor_iostream* iostr, raptor_simple_message_handler error_handler,
       void *error_data, int canonicalize)
              Create a new XML Writer writing to iostream iostr.  The
              error_handler method along with error_data allow error reporting
              to be given.  nstack is either an existing namespace stack to be
              used or if NULL, a new one with only the XML namespace defined
              is created.  Note that raptor_uri_get_handler can be useful to
              return the current raptor URI handler/context.  canonicalize is
              currently unused and should be set to 1 but may allow non-
              canonical XML writing to be allowed in future.

XML WRITER DESTRUCTOR
       void raptor_free_xml_writer(raptor_xml_writer* xml_writer)
              Destroy a XML Writer object.

XML WRITER METHODS
       void raptor_xml_writer_empty_element(raptor_xml_writer* xml_writer,
       raptor_xml_element *element)
              Write XML element element as an empty element (no element
              content) to the XML Writer xml_writer.

       void raptor_xml_writer_start_element(raptor_xml_writer* xml_writer,
       raptor_xml_element *element)
              Write a start element along with an attributes and namespace
              declarations for XML element element to the XML Writer
              xml_writer.

       void raptor_xml_writer_end_element(raptor_xml_writer* xml_writer,
       raptor_xml_element *element)
              Write an end element form for XML element element to the XML
              Writer xml_writer.

       void raptor_xml_writer_cdata(raptor_xml_writer* xml_writer, const
       unsigned char *str)
              Write XML character data in str to the XML Writer xml_writer.
              The characters in str will be XML escaped.

       void raptor_xml_writer_cdata_counted(raptor_xml_writer* xml_writer,
       const unsigned char* str, unsigned int length)
              Write XML character data in str of length length to the XML
              Writer xml_writer.  The characters in str will be XML escaped.

       void raptor_xml_writer_raw(raptor_xml_writer* xml_writer, const
       unsigned char* str)
              Write character data in str length to the XML Writer xml_writer
              without XML escaping.

       void raptor_xml_writer_raw_counted(raptor_xml_writer* xml_writer, const
       unsigned char* str, unsigned int length)
              Write character data in str of length length to the XML Writer
              xml_writer without XML escaping.

       void raptor_xml_writer_comment(raptor_xml_writer* xml_writer, const
       unsigned char* str)
              Write an XML comment in str to the XML Writer xml_writer.

       void raptor_xml_writer_comment_counted(raptor_xml_writer* xml_writer,
       const unsigned char* str, unsigned int length)
              Write an XML comment in str of length length to the XML Writer
              xml_writer.

       int raptor_xml_writer_features_enumerate(const raptor_feature feature,
       const char **name, raptor_uri **uri, const char **label)
              Return the name, URI, string label (all optional) for an XML
              write feature, returning non-zero if no such feature exists.

       Raptor features have URIs that are constructed from the URI
       http://feature.librdf.org/raptor- and the name so for example feature
       scanForRDF has URI http://feature.librdf.org/raptor-scanForRDF

       int raptor_xml_writer_set_feature(raptor_xml_writer* xml_writer,
       raptor_feature feature, int value)
              Set an XML writer feature feature to a particular value.
              Returns non 0 on failure or if the feature is unknown.  The
              current defined writer features are:
                Feature                                 Values
                RAPTOR_FEATURE_WRITER_AUTO_INDENT       Boolean (non 0 true)
                RAPTOR_FEATURE_WRITER_AUTO_EMPTY        Boolean (non 0 true)
                RAPTOR_FEATURE_WRITER_INDENT_WIDTH      Integer
                RAPTOR_FEATURE_WRITER_XML_DECLARATION   Boolean (non 0 true)

       If the writer_auto_indent feature is set (default true), the XML writer
       will automatically indent the output.

       If the writer_auto_empty feature is set (default true), the XML writer
       will automatically generate empty elements if a start/end element
       sequence has no content.

       If the writer_indent_width feature is set (default 2) if the XML writer
       is outputing indented XML, it will use that many spaces.

       If the writer_xml_declaration feature is set (default true) the XML
       declaration is written at the start of serialized XML.

       int raptor_xml_writer_set_feature_string(raptor_xml_writer *xml_writer,
       raptor_feature feature, const unsigned char *value)
              Set an XML writer feature feature to a particular string value.
              Returns non 0 on failure or if the feature is unknown.  The
              current defined XML writer features are given in
              raptor_xml_writer_set_feature and at present only take integer
              values. If an integer value feature is set with this function,
              value is interpreted as an integer and then that value is used.

       int raptor_xml_writer_get_feature(raptor_xml_writer* xml_writer,
       raptor_feature feature)
              Get XML writer feature integer values.  The allowed feature
              values and types are given under
              raptor_xml_writer_features_enumerate.

       const unsigned char
       *raptor_xml_writer_get_feature_string(raptor_xml_writer* xml_writer,
       raptor_feature feature)
              Get XML writer feature string values. The allowed feature values
              and types are given under raptor_xml_writer_features_enumerate.

       int raptor_xml_writer_get_depth(raptor_xml_writer* xml_writer)
              Get the current XML writer element stack depth.

       void raptor_xml_writer_flush(raptor_xml_writer* xml_writer)
              Flush the XML writer output for any pending writes.

       void raptor_xml_writer_newline(raptor_xml_writer* xml_writer)
              Write a newline to the XML writer (which may trigger indenting
              before the next item).

WORLD CLASS
       This class stores the library state and configuration.  It will be the
       main class for initialsiing and configuring the library in Raptor 2.0.

WORLD CLASS CONSTRUCTOR
       raptor_world* raptor_new_world(void)
              Create a new raptor library object.

WORLD CLASS DESTRUCTOR
       void raptor_free_world(raptor_world* world)
              Destroy a raptor library object and free all resources.

WORLD CLASS METHODS
       int raptor_world_open(raptor_world* world)
              Start using a raptor library - allocate any dependent resources.
              This is optional.

       void raptor_world_set_libxslt_security_preferences(raptor_world *world,
       void *security_preferences)
              See raptor_set_libxslt_security_preferences() description.

       void raptor_world_set_libxml_flags(raptor_world *world,  int flags)
              See raptor_set_libxml_flags() description.

API CHANGES
   1.4.21
       No changes.

   1.4.20
       No changes.

   1.4.19
       Added raptor_world class to prepare for V2 API with constructor
       raptor_new_world(), destructor raptor_free_world() and methods
       raptor_world_open(), raptor_world_set_libxslt_security_preferences()
       and raptor_world_set_libxml_flags().

       The raptor_identifier, raptor_error_handlers structs both gained a
       raptor_world* pointer field.

       Added raptor_set_libxslt_security_preferences() and
       raptor_set_libxml_flags().

       Added raptor_libxml_flags enum for flags for
       raptor_world_set_libxml_flags() and raptor_set_libxml_flags().

       Added RAPTOR_FEATURE_PREFIX_ELEMENTS

   1.4.18
       Added atom serializer

       Added rdfa parser

       Added serializer features RAPTOR_FEATURE_RSS_TRIPLES and
       RAPTOR_FEATURE_ATOM_ENTRY_URI

       Added raptor_qname_to_counted_name()

       Added raptor_serialize_start_to_iostream()

       Added raptor_sequence_delete_at()

       Added raptor_xml_writer_newline()

       Added raptor_xml_writer_flush()

       Added raptor_xml_writer_get_depth()

   1.4.17
       Added SAX2 class raptor_sax2.  Added new SAX2 API typedefs:
       raptor_sax2_start_element_handler, raptor_sax2_end_element_handler,
       raptor_sax2_characters_handler, raptor_sax2_cdata_handler,
       raptor_sax2_comment_handler, raptor_sax2_unparsed_entity_decl_handler
       and raptor_sax2_external_entity_ref_handler.  Added new SAX2 API
       functions: raptor_new_sax2(), raptor_free_sax2(),
       raptor_sax2_set_start_element_handler(),
       raptor_sax2_set_end_element_handler(),
       raptor_sax2_set_characters_handler(), raptor_sax2_set_cdata_handler(),
       raptor_sax2_set_comment_handler(),
       raptor_sax2_set_unparsed_entity_decl_handler(),
       raptor_sax2_set_external_entity_ref_handler(),
       raptor_sax2_set_namespace_handler(), raptor_sax2_parse_start(),
       raptor_sax2_parse_chunk(), raptor_sax2_inscope_xml_language() and
       raptor_sax2_inscope_base_uri()

       Added features RAPTOR_FEATURE_WRITE_BASE_URI,
       RAPTOR_FEATURE_WWW_HTTP_CACHE_CONTROL,
       RAPTOR_FEATURE_WWW_HTTP_USER_AGENT, RAPTOR_FEATURE_JSON_CALLBACK and
       RAPTOR_FEATURE_JSON_EXTRA_DATA

       Added raptor_handler_closure structure for error handlers.

       Added raptor_statement_compare()

       Added raptor_iostream_write_string_python() and deprecated
       raptor_iostream_write_string_turtle()

       raptor_uri_set_handler(), raptor_uri_get_handler(),
       raptor_new_namespaces(), raptor_namespaces_init() and
       raptor_new_xml_writer() now take const handler pointers.

       Added raptor_www_set_http_cache_control()

       Added QName class methods: raptor_qname_get_local_name(),
       raptor_qname_get_value() and raptor_qname_get_counted_value()

       Added raptor_iostream read handler typedefs
       raptor_iostream_read_bytes_func, raptor_iostream_read_eof_func and
       added new structure raptor_iostream_handler2 replacing deprecated
       raptor_iostream_handler.

       Added raptor_new_iostream_from_handler2() replacing deprecated
       raptor_new_iostream_from_handler()

       Added raptor_new_iostream_from_sink(),
       raptor_new_iostream_from_filename(),
       raptor_new_iostream_from_file_handle() and
       raptor_new_iostream_from_string().

       Added raptor_iostream_tell deprecating
       raptor_iostream_get_bytes_written_count().

       Added raptor_iostream_read_bytes() and raptor_iostream_read_eof().

       Added raptor_xml_element_get_language().

       Added new enum raptor_log_level.

       Added new typedef raptor_error_handlers.  and new function
       raptor_error_handlers_init().

   1.4.16
       raptor_namespaces_init() now returns an integer status

       Added raptor_new_xml_element_from_namespace_local_name()

       Added raptor_uri_compare().

       Added new features for the 'grddl' parser:
       RAPTOR_FEATURE_HTML_TAG_SOUP, RAPTOR_FEATURE_MICROFORMATS and
       RAPTOR_FEATURE_HTML_LINK.

       Added parser feature RAPTOR_FEATURE_WWW_TIMEOUT

       Added raptor_graph_handler typedef and raptor_set_graph_handler()

       Added raptor_www_final_uri_handler typedef and
       raptor_www_set_final_uri_handler()

       Added raptor_www_set_connection_timeout()

       Added raptor_www_get_final_uri()

   1.4.15
       No changes.

   1.4.14
       Add two new exported strings raptor_license_string and
       raptor_home_url_string.

       Added new features for the 'dot' serializer:
       RAPTOR_FEATURE_RESOURCE_BORDER, RAPTOR_FEATURE_LITERAL_BORDER,
       RAPTOR_FEATURE_BNODE_BORDER, RAPTOR_FEATURE_RESOURCE_FILL,
       RAPTOR_FEATURE_LITERAL_FILL and RAPTOR_FEATURE_BNODE_FILL

       Added raptor_parser_generate_id()

       Added raptor_iostream_write_string_turtle()

   1.4.13
       No API changes.

   1.4.12
       No API changes.

   1.4.11
       Added raptor_get_feature_count()

       Added raptor_get_need_base_uri()

       Added parser feature RAPTOR_FEATURE_NO_NET

       Added raptor_www_set_uri_filter(), raptor_parser_set_uri_filter() with
       filter type raptor_uri_filter_func

   1.4.10
       No API changes.

   1.4.9
       Added raptor_parser_get_accept_header()

       Added raptor_xml_element_is_empty()

       Added raptor_qname_get_namespace()

       Added raptor_iostream_write_uri()

       Added raptor_namespaces_qname_from_uri().

       Added raptor_namespace_get_counted_prefix()

       Added raptor_serialize_set_namespace_from_namespace()

       Deprecated raptor_uri_is_file_uri() for new
       raptor_uri_string_is_file_uri().

       Added raptor_xml_element_get_attributes() and
       raptor_xml_element_get_attributes_count()

   1.4.8
       Added raptor_set_namespace_handler().

       Added XML 1.1 serializing support, feature
       RAPTOR_FEATURE_WRITER_XML_VERSION with shortname xmlVersion for
       serializer and xml writer classes to support it.  Added XML writer
       feature RAPTOR_FEATURE_WRITER_XML_DECLARATION to control generation of
       the XML declaration.  Added new functions
       raptor_xml_any_escape_string() and
       raptor_iostream_write_xml_any_escaped_string() to allow generating XML
       1.1 or XML 1.0.

       RAPTOR_IDENTIFIER_TYPE_PREDICATE will no longer be generated from
       version 1.4.9 onwards as the type of returned statement predicates.
       RAPTOR_IDENTIFIER_TYPE_RESOURCE will be returned.

       RAPTOR_IDENTIFIER_TYPE_ORDINAL may no longer be generated from version
       1.4.9 onwards, RAPTOR_IDENTIFIER_TYPE_RESOURCE may replace it.

   1.4.7
       No changes.

   1.4.6
       No changes.

   1.4.5
       Deprecated raptor_ntriples_string_as_utf8_string() (never documented
       above) since it can only work with a raptor_parser object which makes
       it rather unusable alone.

       Added XML writer features and support functions
       raptor_xml_writer_features_enumerate(),
       raptor_xml_writer_set_feature(),
       raptor_xml_writer_set_feature_string(), raptor_xml_writer_get_feature()
       and raptor_xml_writer_get_feature_string()

   1.4.3
       Added XML Writer class (raptor_xml_writer) and XML Element class
       (raptor_xml_element)

       Added raptor_parser_get_feature_string(),
       raptor_parser_set_feature_string(),
       raptor_serializer_set_feature_string(),
       raptor_serializer_get_feature_string() and raptor_feature_value_type().

       Added raptor_serializer_set_namespace, raptor_serializer_set_feature()
       and raptor_serializer_get_feature().

       Added raptor_new_namespace_from_uri(),
       raptor_new_namespace_parts_from_string(), Added
       raptor_namespaces_find_namespace_by_uri().  and
       raptor_iostream_write_namespace() to write a namespace declaration to
       an iostream.

       Added copy constructor raptor_qname_copy() and
       raptor_iostream_write_qname() to write a qname to an iostream.

       Added raptor_sequence_join() to join two sequences, leaving one empty.

       Added raptor_iostream_write_stringbuffer() to write a stringbuffer to
       an iostream.

       Added N-Triples raptor_iostream_write_string_ntriples() and
       raptor_iostream_write_statement_ntriples() utility functions for
       writing to raptor_iostreams.

       Added raptor_uri_to_relative_counted_uri_string(),
       raptor_uri_to_relative_uri_string().  raptor_uri_print(),
       raptor_uri_to_counted_string() and raptor_uri_to_string()

       Added unicode name checking utility functions for XML 1.0 and XML 1.1
       name starting character and continued name character.
       raptor_unicode_is_xml10_namestartchar raptor_unicode_is_xml10_namechar,
       raptor_unicode_is_xml11_namechar and
       raptor_unicode_is_xml11_namestartchar.

       Added raptor_xml_name_check to check if a name is a legal XML 1.0 or
       1.0 name.  and raptor_iostream_write_xml_escaped_string to write an
       XML-escaped string to an iostream.

       Added UTF8-checking utility function raptor_utf8_check.

   1.4.2
       No changes.

   1.4.1
       The raptor_xml_escape_string now returns <0 on failure rather than 0,
       so that if an empty string is escaped, 0 bytes required is returned.

   1.4.0
       Added new raptor_serializer class supporting RDF/XML (name rdfxml) and
       N-Triples (name ntriples).
       Added new raptor_iostream class
       Added raptor_stringbuffer_copy_to_string to allow efficient copy-out of
       a constructed string.
       Added raptor_www_fetch_to_string to allow retrieving of web content as
       a single string.

   1.3.3
       Added raptor_calloc_memory to provide a calloc inside raptor.
       Added feature check_rdf_id (see raptor_set_feature documentation).

   1.3.2
       Added raptor_alloc_memory to allocate memory inside raptor.

       Added accessor functions for the public raptor_locator structure:

       raptor_locator_line
       raptor_locator_column
       raptor_locator_byte
       raptor_locator_file
       raptor_locator_uri

   1.3.1
       Correct raptor_print_statement declaration argument statement to have
       one less 'const', to match the code.

   1.3.0
       Added the following parser methods, utility methods and helper
       functions:

       raptor_new_parser_for_content (Parser class constructor)
       raptor_get_mime_type
       raptor_get_feature
       raptor_syntax_name_check
       raptor_guess_parser_name
       raptor_features_enumerate
       raptor_feature_from_uri
       raptor_www_set_http_accept (WWW class)

       Changed raptor_set_feature to now return an int success or failure.

       Added the following functions:
       raptor_free_memory
       raptor_unicode_char_to_utf8
       raptor_utf8_to_unicode_char
       raptor_vsnprintf

       Added the raptor_sequence class, its constructor, destructor, methods
       and helper functions.

       Added the raptor_stringbuffer class and constructor, destructor and
       methods.

       Deprecated raptor_print_statement_detailed always intended to be
       internal.

   1.2.0
       Added raptor_syntaxes_enumerate to get full information on syntax mime
       type and URIs as well as name and label.

       N-Triples Plus parser renamed to Turtle (name turtle)

   1.1.0
       Added N-Triples Plus parser (name ntriples-plus)

       Made URI class constructors, methods and factory methods as well as
       some other utility functions using or returning URIs or literals take
       unsigned char* rather than char*.  The affected calls are:

       URI factory methods changed to all take/return unsigned char* for URI
       strings:
       raptor_new_uri_func
       raptor_new_uri_from_local_name_func
       raptor_new_uri_relative_to_base_func
       raptor_uri_as_string_func
       raptor_uri_as_counted_string_func

       Constructors and methods changed to take/return unsigned char* for URI
       strings:
       raptor_statement_part_as_counted_string
       raptor_statement_part_as_string
       raptor_new_uri
       raptor_new_uri_from_uri_local_name
       raptor_new_uri_relative_to_base
       raptor_uri_as_string
       raptor_uri_as_counted_string
       raptor_print_ntriples_string

       Changed to use unsigned char* for URI strings, char* for filenames:
       raptor_uri_resolve_uri_reference
       raptor_uri_filename_to_uri_string
       raptor_uri_uri_string_to_filename
       raptor_uri_uri_string_to_filename_fragment
       raptor_uri_is_file_uri

       Changed to return unsigned char* for UTF8 string:
       raptor_ntriples_string_as_utf8_string

       Added raptor_parsers_enumerate to discover supported parsers.

       Added raptor_uri_uri_string_to_filename_fragment with fragment arg to
       return the URI fragment.

       Made the raptor_namespace, raptor_namespace_stack and raptor_qname
       class and APIs public.

       Added feature non_nfc_fatal (see raptor_set_feature documentation).

   1.0.0
       Removed the following deprecated methods and functions (see 0.9.6
       changes for the new names):
       raptor_free, raptor_new, raptor_ntriples_free, raptor_ntriples_new,
       raptor_ntriples_parse_file, raptor_ntriples_set_error_handler,
       raptor_ntriples_set_fatal_error_handler,
       raptor_ntriples_set_statement_handler and raptor_parser_abort.

       Added raptor_parse_file_stream for reading FILE* streams without
       necessarily having a file.

   0.9.12
       Added raptor_new_uri_for_retrieval to turn URI references into URIs
       suitable for retrieval (no fragments).

   0.9.11
       Added raptor_get_name and raptor_get_label.

       raptor_xml_escape_string now takes error message handler, data pointer,
       loses parser argument.

       Added raptor_set_default_generate_id_parameters and
       raptor_set_generate_id_handler to control the default generation of
       IDs, allow full customisation.

   0.9.10
       Added raptor_set_parser_strict and
       raptor_www_no_www_library_init_finish.

       raptor_xml_escape_string now takes an output string length pointer.

       Added raptor_statement_part_as_counted_string,
       raptor_statement_part_as_string and raptor_parse_abort.

       Deprecated raptor_parser_abort.

   0.9.9
       Added raptor_www class and all its constructors, destructor, methods,
       calls.

       Added raptor_parse_uri, raptor_parser_abort,
       raptor_ntriples_term_as_string and raptor_xml_escape_string.

   0.9.7
       raptor_parse_chunk, raptor_new_uri_from_id, arguments are now unsigned
       char.

       Added raptor_new_uri_for_xmlbase.

   0.9.6
       In this version, the raptor/ntriples parser calling APIs were modified.
       The following table lists the changes:

       OLD API                                  NEW API (0.9.6+)
       raptor_new()                             raptor_new_parser("rdfxml")
       ntriples_new()                           raptor_new_parser("ntriples")
       raptor_free                              raptor_free_parser
       ntriples_free                            raptor_ntriples_parser
       raptor_ntriples_parse_file               raptor_parse_file
       raptor_ntriples_set_error_handler        raptor_set_error_handler
       raptor_ntriples_set_fatal_error_handler  raptor_set_fatal_error_handler
       raptor_ntriples_set_statement_handler    raptor_set_statement_handler

CONFORMING TO
       RDF/XML Syntax (Revised), Dave Beckett (ed.)  W3C Recommendation,
       http://www.w3.org/TR/rdf-syntax-grammar/http://www.w3.org/TR/rdf-
       syntax-grammar/⟩

       N-Triples, in RDF Test Cases, Jan Grant and Dave Beckett (eds.)  W3C
       Recommendation, http://www.w3.org/TR/rdf-testcases/#ntripleshttp://www.w3.org/TR/rdf-testcases/#ntriplesTurtle - Terse RDF Triple Language, Dave Beckett,
       http://www.dajobe.org/2004/01/turtle/http://www.dajobe.org/2004/01/turtle/RSS 0.91 spec revision 3, Dan Libby, Netscape,
       http://my.netscape.com/publish/formats/rss-spec-0.91.htmlhttp://my.netscape.com/publish/formats/rss-spec-0.91.htmlRDF Site Summary (RSS) 1.0, http://purl.org/rss/1.0/spechttp://purl.org/rss/1.0/specAtom 1.0 syndication format, RFC 4287,
       http://www.ietf.org/rfc/rfc4287.txthttp://www.ietf.org/rfc/rfc4287.txtGleaning Resource Descriptions from Dialects of Languages (GRDDL), Dan
       Connolly (ed.), W3C Recommendation, 2007-09-11,
       http://www.w3.org/TR/2007/REC-grddl-20070911/http://www.w3.org/TR/2007/REC-grddl-20070911/RDFa in XHTML: Syntax and Processing, Ben Adida, Mark Birbeck, Shane
       McCarron, Steven Pemberton (eds.)
        W3C Recommendation, 2008-10-14, http://www.w3.org/TR/2008/REC-rdfa-
       syntax-20081014/ ⟨http://www.w3.org/TR/2008/REC-rdfa-syntax-20081014/SEE ALSO
       rapper(1),raptor-config(1)

AUTHOR
       Dave Beckett - http://www.dajobe.org/http://www.dajobe.org/⟩



                                  2010-01-29                      libraptor(3)