Redland Resource Description Framework (RDF) Library

0.9.19

 #include <redland.h>

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 0.9.15 functions for the C API but does not claim to be a complete summary of the entire API at this time. 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. Documentation on the Perl and Python APIs in POD and Pydoc respectively are also available.

The functions defined by redland are all defined with the CWlibrdf_ prefix

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)

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)

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)

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)

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)

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

CWLIBRDF_URI_RDF_MS and CWLIBRDF_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)

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)

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)

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)

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)

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)

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)

  #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);

libraptor(3), libxml(4).

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

Dave Beckett <http://purl.org/net/dajobe/>, Institute for Learning and Research Technology <http://www.ilrt.bris.ac.uk/>, University of Bristol, <http://www.bristol.ac.uk/>