class SPARQL::Algebra::Operator::Datatype
The SPARQL
`datatype` operator.
@example
(prefix ((xsd: <http://www.w3.org/2001/XMLSchema#>) (rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>) (: <http://example.org/>)) (project (?s) (filter (= (datatype (xsd:double ?v)) xsd:double) (bgp (triple ?s :p ?v)))))
Constants
- NAME
Public Instance Methods
apply(literal, **options)
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Returns the datatype IRI
of the operand.
If
the operand is a simple literal, returns a datatype of `xsd:string`.
@param [RDF::Literal] literal
a typed or simple literal
@return [RDF::URI] the datatype IRI
, or `xsd:string` for simple literals @raise [TypeError] if the operand is not a typed or simple literal
# File lib/sparql/algebra/operator/datatype.rb, line 30 def apply(literal, **options) case literal when RDF::Literal then literal.datatype else raise TypeError, "expected an RDF::Literal, but got #{literal.inspect}" end end