rdf4h-1.1.0: A library for RDF processing in Haskell

Data.RDF.Query

Contents

Synopsis

# Query functions

Answer the given list of triples in sorted order.

Determine whether two triples have equal subjects.

Determine whether two triples have equal predicates.

Determine whether two triples have equal objects.

Answer the subject node of the triple.

Answer the predicate node of the triple.

Answer the object node of the triple.

isEmpty :: RDF rdf => rdf -> BoolSource

Determines whether the `RDF` contains zero triples.

rdfContainsNode :: forall rdf. RDF rdf => rdf -> Node -> BoolSource

Answer if rdf contains node.

Answer if triple contains node.

Remove duplicate triples, returning unique triples. This function may return the triples in a different order than given.

listSubjectsWithPredicate :: RDF rdf => rdf -> Predicate -> [Subject]Source

Lists of all subjects of triples with the given predicate.

listObjectsOfPredicate :: RDF rdf => rdf -> Predicate -> [Object]Source

Lists of all objects of triples with the given predicate.

# RDF graph functions

isIsomorphic :: forall rdf1 rdf2. (RDF rdf1, RDF rdf2) => rdf1 -> rdf2 -> BoolSource

This determines if two RDF representations are equal regardless of blank node names, triple order and prefixes. In math terms, this is the simeq latex operator, or ~=

expandTriples :: RDF rdf => rdf -> TriplesSource

Expand the triples in a graph with the prefix map and base URL for that graph.

fromEither :: RDF rdf => Either ParseFailure rdf -> rdfSource

Convert a parse result into an RDF if it was successful and error and terminate if not.