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Rasqal RDF Query Library Manual | ![]() |
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typedef rasqal_triples_match; typedef rasqal_triples_source; rasqal_triples_source_factory; void rasqal_set_triples_source_factory (void (register_fnrasqal_triples_source_factory *factory) (), void *user_data);
A factory that provides the raw triple matches for a triple pattern against some RDF graph. The rasqal_triples_source_factory must create use a new rasqal_triples_source that can be used to initialise and build a rasqal_triples_match for some rasqal_triple (subject, predicate, object, origin URI).
typedef struct rasqal_triples_match_s rasqal_triples_match;
Triples match structure as initialised by rasqal_triples_source method init_triples_match.
typedef struct rasqal_triples_source_s rasqal_triples_source;
Triples source as initialised by a rasqal_triples_source_factory.
typedef struct { void *user_data; size_t user_data_size; int (*new_triples_source)(rasqal_query* query, void *factory_user_data, void *user_data, rasqal_triples_source* rts); } rasqal_triples_source_factory;
A factory that initialises rasqal_triples_source structures to returning matches to a triple pattern.
void * |
User data for triples_source_factory. |
size_t |
Size Of user_data for new_triples_source.
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Create a new triples source - returns non-zero on failure < 0 is a 'no rdf data error', > 0 is an unspecified error.. |
void rasqal_set_triples_source_factory (void (register_fnrasqal_triples_source_factory *factory) (), void *user_data);
Register the factory to return triple sources.
Registers the factory that returns triples sources. Note that there is only one of these per runtime.
The rasqal_triples_source_factory factory method new_triples_source is called with the user data for some query and rasqal_triples_source.
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registration function |
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user data for registration |