]> Triples 3 RASQAL Library Triples Triple pattern or RDF triple. rasqal_triple; enum rasqal_triple_flags; rasqal_triple* rasqal_new_triple (rasqal_literal *subject, rasqal_literal *predicate, rasqal_literal *object); rasqal_triple* rasqal_new_triple_from_triple (rasqal_triple *t); void rasqal_free_triple (rasqal_triple *t); rasqal_literal* rasqal_triple_get_origin (rasqal_triple *t); enum rasqal_triple_parts; void rasqal_triple_print (rasqal_triple *t, FILE *fh); void rasqal_triple_set_origin (rasqal_triple *t, rasqal_literal *l); An object for a triple pattern or an RDF triple in a query. It contains the three parts of an RDF triple - subject, predicate, object as well as origin for matching triples in some graph (such as with the SPARQL GRAPH). rasqal_tripletypedef struct { rasqal_literal* subject; rasqal_literal* predicate; rasqal_literal* object; rasqal_literal* origin; unsigned int flags; } rasqal_triple; A triple pattern or RDF triple. This is used as a triple pattern in queries and an RDF triple when generating RDF triples such as with SPARQL CONSTRUCT. rasqal_literal *subject; Triple subject. rasqal_literal *predicate; Triple predicate. rasqal_literal *object; Triple object. rasqal_literal *origin; Triple origin. unsigned int flags; Or of enum rasqal_triple_flags bits. rasqal_triple_flagstypedef enum { /* Not used - was only used internally in the execution engine */ RASQAL_TRIPLE_FLAGS_EXACT=1, /* Not used - this is now a property of a graph pattern */ RASQAL_TRIPLE_FLAGS_OPTIONAL=2, RASQAL_TRIPLE_FLAGS_LAST=RASQAL_TRIPLE_FLAGS_OPTIONAL } rasqal_triple_flags; Flags for triple patterns. RASQAL_TRIPLE_FLAGS_EXACT Not used. RASQAL_TRIPLE_FLAGS_OPTIONAL Not used. RASQAL_TRIPLE_FLAGS_LAST Internal. rasqal_new_triplerasqal_triple* rasqal_new_triple (rasqal_literal *subject, rasqal_literal *predicate, rasqal_literal *object); Constructor - create a new rasqal_triple triple or triple pattern. The triple origin can be set with rasqal_triple_set_origin(). subject : Triple subject. predicate : Triple predicate. object : Triple object. Returns : a new rasqal_triple or NULL on failure. rasqal_new_triple_from_triplerasqal_triple* rasqal_new_triple_from_triple (rasqal_triple *t); Copy constructor - create a new rasqal_triple from an existing one. t : Triple to copy. Returns : a new rasqal_triple or NULL on failure. rasqal_free_triplevoid rasqal_free_triple (rasqal_triple *t); Destructor - destroy a rasqal_triple object. t : rasqal_triple object. rasqal_triple_get_originrasqal_literal* rasqal_triple_get_origin (rasqal_triple *t); Get the origin field of a rasqal_triple. t : The triple object. Returns : The triple origin or NULL. rasqal_triple_partstypedef enum { RASQAL_TRIPLE_SUBJECT = 1, RASQAL_TRIPLE_PREDICATE= 2, RASQAL_TRIPLE_OBJECT = 4, RASQAL_TRIPLE_ORIGIN = 8 } rasqal_triple_parts; Flags for parts of a triple. RASQAL_TRIPLE_SUBJECT Subject present in a triple. RASQAL_TRIPLE_PREDICATE Predicate present in a triple. RASQAL_TRIPLE_OBJECT Object present in a triple. RASQAL_TRIPLE_ORIGIN Origin present in a triple. rasqal_triple_printvoid rasqal_triple_print (rasqal_triple *t, FILE *fh); Print a Rasqal triple in a debug format. The print debug format may change in any release. t : rasqal_triple object. fh : The FILE* handle to print to. rasqal_triple_set_originvoid rasqal_triple_set_origin (rasqal_triple *t, rasqal_literal *l); Set the origin field of a rasqal_triple. t : The triple object. l : The rasqal_literal object to set as origin.