X-based Functions
This section shows how to define XFunctions. The defined function can be used within a SPARQL query.
Example data graph
@prefix ex: <http://example.org/ns#> .
ex:JohnDoe a ex:Person ;
ex:name "John" ;
ex:surname "Doe" .
Example shapes graph
ex:FullNameShape
a sh:NodeShape ;
sh:targetClass ex:Person ;
sh:rule [
a sh:SPARQLRule ;
sh:construct """
PREFIX ex: <http://example.org/ns#>
CONSTRUCT {
$this ex:fullName ?fullName .
}
WHERE {
$this ex:name ?name .
$this ex:surname ?surname .
BIND(ex:concat(?name, ?surname) AS ?fullName)
}
"""
] .
ex:concat
a sh:JSFunction ;
sh:parameter [
sh:path ex:arg1 ;
sh:datatype xsd:integer ;
] ;
sh:parameter [
sh:path ex:arg2 ;
sh:datatype xsd:integer ;
] ;
sh:returnType xsd:integer ;
sh:jsLibrary [ sh:jsLibraryURL "http://shacl-x-web/utils.js"^^xsd:anyURI ] ;
sh:jsFunctionName "concat" .
ex:FullNameShape
a sh:NodeShape ;
sh:targetClass ex:Person ;
sh:rule [
a sh:SPARQLRule ;
sh:construct """
PREFIX ex: <http://example.org/ns#>
CONSTRUCT {
$this ex:fullName ?fullName .
}
WHERE {
$this ex:name ?name .
$this ex:surname ?surname .
BIND(ex:concat(?name, ?surname) AS ?fullName)
}
"""
] .
ex:concat
a sh:PyFunction ;
sh:parameter [
sh:path ex:arg1 ;
sh:datatype xsd:integer ;
] ;
sh:parameter [
sh:path ex:arg2 ;
sh:datatype xsd:integer ;
] ;
sh:returnType xsd:integer ;
sh:pyLibrary [ sh:pyLibraryURL "http://shacl-x-web/utils.py"^^xsd:anyURI ] ;
sh:pyFunctionName "concat" .
Example X function
function concat($arg1, $arg2) {
return $arg1.getLex() + " " + $arg2.getLex();
}
def concat(_arg1, _arg2):
return _arg1.getLex() + " " + _arg2.getLex()
Example inferred triples
ex:JohnDoe ex:fullName "John Doe" .