NAME

       redland - Resource Description Framework (RDF) Library

VERSION

       1.0.16

SYNOPSIS

        #include <redland.h>

DESCRIPTION

       redland is a library providing support for the Resource Description Framework (RDF)
       written in ANSI C with APIs in several other languages.

       This manual page lists most of the redland public API functions but does not claim to be a
       complete summary of the entire API.  For the complete API with full details of the
       function interface, see the HTML API documentation either on the Redland web site at
       <http://librdf.org/> or with the software release in the docs/api directory.

FUNCTIONS

       The functions defined by redland are all defined with the "librdf_" prefix

   class world
       librdf_world* librdf_new_world(void)
       void librdf_free_world(librdf_world* world)
       void librdf_world_open(librdf_world* world)
       void librdf_world_set_error(librdf_world* world, void* user_data, void (*error_fn)(void*
       user_data, const char* msg, ...))
       void librdf_world_set_warning(librdf_world* world, void* user_data, void
       (*warning_fn)(void* user_data, const char* msg, ...))
       void librdf_world_set_digest(librdf_world*, const char* name)
       void librdf_world_set_uris_hash(librdf_world* world, librdf_hash* uris_hash)
       const char* librdf_world_get_feature(librdf_world* world, librdf_uri* feature)
       int librdf_world_set_feature(librdf_world* world, librdf_uri* feature, const char* value)

   class iterator
       librdf_iterator* librdf_new_iterator(librdf_world* world, void* context, int
       (*is_end)(void*), void* (*get_next)(void*), void (*finished)(void*))
       void librdf_free_iterator(librdf_iterator*)
       int librdf_iterator_end(librdf_iterator* iterator)
       int librdf_iterator_finished(librdf_iterator* iterator)
       int librdf_iterator_next(librdf_iterator* iterator)
       void* librdf_iterator_get_object(librdf_iterator* iterator)
       void* librdf_iterator_get_context(librdf_iterator* iterator)
       void* librdf_iterator_get_key(librdf_iterator* iterator)
       void* librdf_iterator_get_value(librdf_iterator* iterator)
       int librdf_iterator_add_map(librdf_iterator* iterator, void* (*fn)(void* context, void*
       item), void* context)
       void* librdf_iterator_map_remove_duplicate_nodes(void* item, void* user_data)

   class digest
       void librdf_digest_register_factory(librdf_world* world, const char* name, void (*factory)
       (librdf_digest_factory*))
       librdf_digest_factory* librdf_get_digest_factory(librdf_world* world, const char* name)
       librdf_digest* librdf_new_digest(librdf_world* world, char* name)
       librdf_digest* librdf_new_digest_from_factory(librdf_world* world, librdf_digest_factory*
       factory)
       void librdf_free_digest(librdf_digest* digest)
       void librdf_digest_init(librdf_digest* digest)
       void librdf_digest_update(librdf_digest* digest, unsigned char* buf, size_t length)
       void librdf_digest_final(librdf_digest* digest)
       void* librdf_digest_get_digest(librdf_digest* digest)
       char* librdf_digest_to_string(librdf_digest* digest)
       void librdf_digest_print(librdf_digest* digest, FILE* fh)

   class uri
       librdf_uri* librdf_new_uri(librdf_world* world, const unsigned char * string)
       librdf_uri* librdf_new_uri_from_uri(librdf_uri* uri)
       librdf_uri* librdf_new_uri_from_uri_local_name(librdf_uri* uri, const unsigned char*
       local_name)
       void librdf_free_uri(librdf_uri* uri)
       unsigned char* librdf_uri_as_string(librdf_uri* uri)
       unsigned char* librdf_uri_as_counted_string(librdf_uri* uri, size_t* len_p)
       librdf_digest* librdf_uri_get_digest(librdf_uri* uri)
       void librdf_uri_print>(librdf_uri* uri, FILE* fh)
       unsigned char* librdf_uri_to_string(librdf_uri* uri)
       unsigned char* librdf_uri_to_counted_string(librdf_uri* uri, size_t* len_p)
       int librdf_uri_equals(librdf_uri* first_uri, librdf_uri* second_uri)
       int librdf_uri_is_file_uri(librdf_uri* uri)
       const char* librdf_uri_to_filename(librdf_uri* uri)
       librdf_uri* librdf_new_uri_normalised_to_base(const unsigned char* uri_string, librdf_uri*
       source_uri, librdf_uri* base_uri)
       librdf_uri* librdf_new_uri_relative_to_base(librdf_uri* base_uri, const unsigned char*
       uri_string)
       librdf_uri* librdf_new_uri_from_filename(librdf_world* world, const char* filename)

   class node
       librdf_node* librdf_new_node(librdf_world* world)
       librdf_node* librdf_new_node_from_uri_string(librdf_world* world, const char* string)
       librdf_node* librdf_new_node_from_uri(librdf_world* world, librdf_uri* uri)
       librdf_node* librdf_new_node_from_uri_local_name(librdf_world* world, librdf_uri* uri,
       const char* local_name)
       librdf_node* librdf_new_node_from_normalised_uri_string(librdf_world* world, const char*
       uri_string, librdf_uri* source_uri, librdf_uri* base_uri)
       librdf_node* librdf_new_node_from_literal(librdf_world* world, const char* string, const
       char* xml_language, int xml_space, int is_wf_xml)
       librdf_node* librdf_new_node_from_typed_literal(librdf_world* world, const unsigned char*
       string, const char* xml_language, librdf_uri* datatype_uri)
       librdf_node* librdf_new_node_from_blank_identifier(librdf_world* world, const unsigned
       char* identifier)
       librdf_node* librdf_new_node_from_node(librdf_node* node)
       void librdf_node_init(librdf_world* world, librdf_node* node)
       void librdf_free_node(librdf_node* r)
       librdf_uri* librdf_node_get_uri(librdf_node* node)
       librdf_node_type librdf_node_get_type(librdf_node* node)
       unsigned char* librdf_node_get_literal_value(librdf_node* node)
       unsigned char* librdf_node_get_literal_value_as_counted_string(librdf_node* node, size_t*
       len_p)
       char* librdf_node_get_literal_value_as_latin1(librdf_node* node)
       char* librdf_node_get_literal_value_language(librdf_node* node)
       int librdf_node_get_literal_value_is_wf_xml(librdf_node* node)
       librdf_uri* librdf_node_get_literal_value_datatype_uri(librdf_node* node)
       int librdf_node_get_li_ordinal(librdf_node* node)
       unsigned char* librdf_node_get_blank_identifier(librdf_node* node)
       int librdf_node_is_resource(librdf_node* node)
       int librdf_node_is_literal(librdf_node* node)
       int librdf_node_is_blank(librdf_node* node)
       librdf_digest* librdf_node_get_digest(librdf_node* node)
       size_t librdf_node_encode(librdf_node* node, unsigned char* buffer, size_t length)
       size_t librdf_node_decode(librdf_node* node, unsigned char* buffer, size_t length)
       unsigned char* librdf_node_to_string(librdf_node* node)
       unsigned char* librdf_node_to_counted_string(librdf_node* node, size_t* len_p)
       void librdf_node_print(librdf_node* node, FILE* fh)
       int librdf_node_equals(librdf_node* first_node, librdf_node* second_node)

   class concepts
       The library provides macros for all of the RDF and RDFS concepts - nodes and URIs.  For
       example, "LIBRDF_MS_Alt" for the librdf_node for the rdf:Alt concept and
       "LIBRDF_MS_Alt_URI" for the librdf_uri for the URI reference of rdf:Alt.

       "LIBRDF_URI_RDF_MS" and "LIBRDF_URI_RDF_SCHEMA" provide the librdf_uri objects for the RDF
       and RDFS namespace URIs.  They must be copied using librdf_new_uri_from_uri to be shared
       correctly.

       void librdf_get_concept_by_name(librdf_world* world, int is_ms, const char* name,
       librdf_uri **uri_p, librdf_node **node_p)

   class statement
       librdf_statement* librdf_new_statement(librdf_world* world)
       librdf_statement* librdf_new_statement_from_statement(librdf_statement* statement)
       librdf_statement* librdf_new_statement_from_nodes(librdf_world* world, librdf_node*
       subject, librdf_node* predicate, librdf_node* object)
       void librdf_statement_init(librdf_world* world, librdf_statement* statement)
       void librdf_statement_clear(librdf_statement* statement)
       void librdf_free_statement(librdf_statement* statement)
       librdf_node* librdf_statement_get_subject(librdf_statement* statement)
       void librdf_statement_set_subject(librdf_statement* statement, librdf_node* subject)
       librdf_node* librdf_statement_get_predicate(librdf_statement* statement)
       void librdf_statement_set_predicate(librdf_statement* statement, librdf_node* predicate)
       librdf_node* librdf_statement_get_object(librdf_statement* statement)
       void librdf_statement_set_object(librdf_statement* statement, librdf_node* object)
       int librdf_statement_is_complete(librdf_statement* statement)
       char* librdf_statement_to_string(librdf_statement* statement)
       void librdf_statement_print(librdf_statement* statement, FILE* fh)
       int librdf_statement_equals(librdf_statement* statement1, librdf_statement* statement2)
       int librdf_statement_match(librdf_statement* statement, librdf_statement*
       partial_statement)
       size_t librdf_statement_encode(librdf_statement* statement, unsigned char* buffer, size_t
       length)
       size_t librdf_statement_encode_parts(librdf_statement* statement, unsigned char* buffer,
       size_t length, librdf_statement_part fields)
       size_t librdf_statement_decode(librdf_statement* statement, unsigned char* buffer, size_t
       length)
       size_t librdf_statement_decode_parts(librdf_statement* statement, librdf_node**
       context_node, unsigned char* buffer, size_t length)

   class model
       librdf_model* librdf_new_model(librdf_world* world, librdf_storage* storage, char*
       options_string)
       librdf_model* librdf_new_model_with_options(librdf_world* world, librdf_storage* storage,
       librdf_hash* options)
       librdf_model* librdf_new_model_from_model(librdf_model* model)
       void librdf_free_model(librdf_model* model)
       int librdf_model_size(librdf_model* model)
       int librdf_model_add(librdf_model* model, librdf_node* subject, librdf_node* predicate,
       librdf_node* object)
       int librdf_model_add_string_literal_statement(librdf_model* model, librdf_node* subject,
       librdf_node* predicate, char* string, char* xml_language, int xml_space, int is_wf_xml)
       int librdf_model_add_typed_literal_statement(librdf_model* model, librdf_node* subject,
       librdf_node* predicate, const unsigned char* string, char* xml_language, librdf_uri*
       datatype_uri)
       int librdf_model_add_statement(librdf_model* model, librdf_statement* statement)
       int librdf_model_add_statements(librdf_model* model, librdf_stream* statement_stream)
       int librdf_model_remove_statement(librdf_model* model, librdf_statement* statement)
       int librdf_model_contains_statement(librdf_model* model, librdf_statement* statement)
       int librdf_model_has_arc_in(librdf_model* model, librdf_node* node, librdf_node* property)
       int librdf_model_has_arc_out(librdf_model* model, librdf_node* node, librdf_node*
       property)
       librdf_stream* librdf_model_as_stream(librdf_model* model)
       librdf_stream* librdf_model_find_statements(librdf_model* model, librdf_statement*
       statement)
       librdf_stream* librdf_model_find_statements_in_context(librdf_model* model,
       librdf_statement* statement, librdf_node* context_node)
       librdf_stream* librdf_model_find_statements_with_options(librdf_model* model,
       librdf_statement* statement, librdf_node* context_node, librdf_hash* options)
       librdf_iterator* librdf_model_get_contexts(librdf_model* model)
       librdf_iterator* librdf_model_get_sources(librdf_model* model, librdf_node* arc,
       librdf_node* target)
       librdf_iterator* librdf_model_get_arcs(librdf_model* model, librdf_node* source,
       librdf_node* target)
       librdf_iterator* librdf_model_get_targets(librdf_model* model, librdf_node* source,
       librdf_node* arc)
       librdf_node* librdf_model_get_source(librdf_model* model, librdf_node* arc, librdf_node*
       target)
       librdf_node* librdf_model_get_arc(librdf_model* model, librdf_node* source, librdf_node*
       target)
       librdf_node* librdf_model_get_target(librdf_model* model, librdf_node* source,
       librdf_node* arc)
       librdf_iterator* librdf_model_get_arcs_in(librdf_model* model, librdf_node* node)
       librdf_iterator* librdf_model_get_arcs_out(librdf_model* model, librdf_node* node)
       int librdf_model_add_submodel(librdf_model* model, librdf_model* sub_model)
       int librdf_model_remove_submodel(librdf_model* model, librdf_model* sub_model)
       void librdf_model_print(librdf_model* model, FILE* fh)
       int librdf_model_context_add_statement(librdf_model* model, librdf_node* context,
       librdf_statement* statement)
       int librdf_model_context_add_statements(librdf_model* model, librdf_node* context,
       librdf_stream* stream)
       int librdf_model_context_remove_statement(librdf_model* model, librdf_node* context,
       librdf_statement* statement)
       int librdf_model_context_remove_statements(librdf_model* model, librdf_node* context)
       librdf_stream* librdf_model_context_as_stream(librdf_model* model, librdf_node* context)
       librdf_stream* librdf_model_query(librdf_model* model, librdf_query* query)
       librdf_stream* librdf_model_query_string(librdf_model* model, const char* name,
       librdf_uri* uri, const unsigned char* query_string)
       void librdf_model_sync(librdf_model* model)
       librdf_storage* librdf_model_get_storage(librdf_model* model)
       librdf_node* librdf_model_get_feature(librdf_model* model, librdf_uri* feature) =item int
       librdf_model_set_feature(librdf_model* model, librdf_uri* feature, librdf_node* value)

   class storage
       void librdf_storage_register_factory(const char* name, void (*factory)
       (librdf_storage_factory*))
       librdf_storage* librdf_new_storage(librdf_world* world, char* storage_name, char* name,
       char* options_string)
       librdf_storage* librdf_new_storage_with_options(librdf_world* world, char* storage_name,
       char* name, librdf_hash* options)
       librdf_storage* librdf_new_storage_from_storage(librdf_storage* old_storage)
       librdf_storage* librdf_new_storage_from_factory(librdf_world* world,
       librdf_storage_factory* factory, char* name, librdf_hash* options)
       void librdf_free_storage(librdf_storage* storage)
       int librdf_storage_open(librdf_storage* storage, librdf_model* model)
       int librdf_storage_close(librdf_storage* storage)
       int librdf_storage_get(librdf_storage* storage, void* key, size_t key_len, void **value,
       size_t* value_len, unsigned int flags)
       int librdf_storage_size(librdf_storage* storage)
       int librdf_storage_add_statement(librdf_storage* storage, librdf_statement* statement)
       int librdf_storage_add_statements(librdf_storage* storage, librdf_stream*
       statement_stream)
       int librdf_storage_remove_statement(librdf_storage* storage, librdf_statement* statement)
       int librdf_storage_contains_statement(librdf_storage* storage, librdf_statement*
       statement)
       librdf_stream* librdf_storage_serialise(librdf_storage* storage)
       librdf_stream* librdf_storage_find_statements(librdf_storage* storage, librdf_statement*
       statement)
       librdf_iterator* librdf_storage_get_sources(librdf_storage* storage, librdf_node* arc,
       librdf_node* target)
       librdf_iterator* librdf_storage_get_arcs(librdf_storage* storage, librdf_node* source,
       librdf_node* target)
       librdf_iterator* librdf_storage_get_targets(librdf_storage* storage, librdf_node* source,
       librdf_node* arc)
       librdf_iterator* librdf_storage_get_arcs_in(librdf_storage* storage, librdf_node* node)
       librdf_iterator* librdf_storage_get_arcs_out(librdf_storage* storage, librdf_node* node)
       int librdf_storage_has_arc_in(librdf_storage* storage, librdf_node* node, librdf_node*
       property)
       int librdf_storage_has_arc_out(librdf_storage* storage, librdf_node* node, librdf_node*
       property)
       int librdf_storage_context_add_statement(librdf_storage* storage, librdf_node* context,
       librdf_statement* statement)
       int librdf_storage_context_add_statements(librdf_storage* storage, librdf_node* context,
       librdf_stream* stream)
       int librdf_storage_context_remove_statement(librdf_storage* storage, librdf_node* context,
       librdf_statement* statement)
       int librdf_storage_context_remove_statements(librdf_storage* storage, librdf_node*
       context)
       librdf_stream* librdf_storage_context_as_stream(librdf_storage* storage, librdf_node*
       context)
       int librdf_storage_supports_query(librdf_storage* storage, librdf_query* query)
       librdf_stream* librdf_storage_query(librdf_storage* storage, librdf_query* query)
       void librdf_storage_sync(librdf_storage* storage)

   class parser
       void librdf_parser_register_factory(librdf_world* world, const char* name, const char*
       mime_type, const char* uri_string, void (*factory) (librdf_parser_factory*))
       librdf_parser* librdf_new_parser(librdf_world* world, const char* name, const char*
       mime_type, librdf_uri* type_uri)
       librdf_parser* librdf_new_parser_from_factory(librdf_world* world, librdf_parser_factory*
       factory)
       void librdf_free_parser(librdf_parser* parser)
       librdf_stream* librdf_parser_parse_as_stream(librdf_parser* parser, librdf_uri* uri,
       librdf_uri* base_uri)
       int librdf_parser_parse_into_model(librdf_parser* parser, librdf_uri* uri, librdf_uri*
       base_uri, librdf_model* model)
       librdf_stream* librdf_parser_parse_string_as_stream(librdf_parser* parser, const unsigned
       char* string, librdf_uri* base_uri)
       int librdf_parser_parse_string_into_model(librdf_parser* parser, const unsigned char*
       string, librdf_uri* base_uri, librdf_model* model)
       void librdf_parser_set_error(librdf_parser* parser, void* user_data, void
       (*error_fn)(void* user_data, const char* msg, ...))
       void librdf_parser_set_warning(librdf_parser* parser, void* user_data, void
       (*warning_fn)(void* user_data, const char* msg, ...))
       librdf_node* librdf_parser_get_feature(librdf_parser* parser, librdf_uri* feature)
       int librdf_parser_set_feature(librdf_parser* parser, librdf_uri* feature, librdf_node*
       value)

   class serializer
       librdf_serializer* librdf_new_serializer(librdf_world* world, const char *name, const char
       *mime_type, librdf_uri *type_uri)
       librdf_serializer* librdf_new_serializer_from_factory(librdf_world* world,
       librdf_serializer_factory *factory)
       void librdf_free_serializer(librdf_serializer *serializer)
       int librdf_serializer_serialize_model(librdf_serializer* serializer, FILE* handle,
       librdf_uri* base_uri, librdf_model* model)
       int librdf_serializer_serialize_model_to_file(librdf_serializer* serializer, const char
       *name, librdf_uri* base_uri, librdf_model* model)
       void librdf_serializer_set_error(librdf_serializer* serializer, void *user_data, void
       (*error_fn)(void *user_data, const char *msg, ...))
       void librdf_serializer_set_warning(librdf_serializer* serializer, void *user_data, void
       (*warning_fn)(void *user_data, const char *msg, ...))
       librdf_node* librdf_serializer_get_feature(librdf_serializer* serializer, librdf_uri*
       feature)
       int librdf_serializer_set_feature(librdf_serializer* serializer, librdf_uri* feature,
       librdf_node* value)b
       int librdf_serializer_set_namespace(librdf_serializer* serializer, librdf_uri* uri, const
       char* prefix)

   class stream
       librdf_stream* librdf_new_stream(librdf_world* world, void* context, int
       (*end_of_stream)(void*), librdf_statement* (*next_statement)(void*), void
       (*finished)(void*))
       librdf_stream* librdf_new_stream_from_node_iterator(librdf_iterator* iterator,
       librdf_statement* statement, librdf_statement_part field)
       void librdf_free_stream(librdf_stream* stream)
       int librdf_stream_end(librdf_stream* stream)
       int librdf_stream_next(librdf_stream* stream)
       librdf_statement* librdf_stream_get_object(librdf_stream* stream)
       void* librdf_stream_get_context(librdf_stream* stream)
       void librdf_stream_set_map(librdf_stream* stream, librdf_statement* (*map)(void* context,
       librdf_statement* statement), void* map_context)
       void librdf_stream_print(librdf_stream* stream, FILE* fh)

EXAMPLES

         #include <redland.h>

         librdf_storage *storage;
         librdf_model* model;
         librdf_statement* statement;
         librdf_world* world

         world=librdf_new_world();

         librdf_world_open(world);

         storage=librdf_new_storage(world, "hashes", "test", "hash-type='bdb',dir='.'");
         model=librdf_new_model(world, storage, NULL);
         statement=librdf_new_statement_from_nodes(world, librdf_new_node_from_uri_string(world, "http://purl.org/net/dajobe/"), librdf_new_node_from_uri_string(world, "http://purl.org/dc/elements/1.1/creator"), librdf_new_node_from_literal(world, "Dave Beckett", NULL, 0));

         librdf_model_add_statement(model, statement);
         librdf_free_statement(statement);

         librdf_model_print(model, stdout);

         librdf_free_model(model);
         librdf_free_storage(storage);
         librdf_free_world(world);

SEE ALSO

       libraptor(3), libxml(4).

HISTORY

       The redland RDF library was created by Dave Beckett in June 2000.

AUTHOR

       Dave Beckett <http://purl.org/net/dajobe/>,