Package org.aksw.jenax.sparql.fragment.impl

Class VirtualPredicate

java.lang.Object

org.aksw.jenax.sparql.fragment.impl.VirtualPredicate

public class VirtualPredicate
extends Object

A triple-based virtual predicate. Given a triple pattern t a union based on t will be created that yields in addition to t triples of the given binary relation if the condition is met: Given e.g. a triple pattern ?x ?y ?z and a virtual predicate to yield rdfs:label for the set of resources for which a dc:title exists: condition: ?foo dc:title ?bar predicate: ?baz rdfs:label ?baa {?x ?y ?z } UNION { ?x ?y ?_z . ?x dc:title ?bar . ?x rdfs:label ?z } condition ?s a Person predicate age: ?s ?a { ?s birthDate ?d . BIND(NOW() - ?d AS ?a } { { ?x ?y z } UNION { ?x a Person . # condition / join on the subject position ?x birthDate ?d BIND(NOW() - ?d AS ?y) } } So if there is a ?s ?p ?o pattern, we take ?s ?p ?o - and add any other binary relations for which the condition is satisfied to a union The condition can be read as: For all triples belonging to the set of resources matching the condition, apply the binary relation

Author:

raven Mar 7, 2018

Field Summary

Fields

Modifier and Type	Field	Description
protected Fragment3	condition
protected Fragment2	predicate

Constructor Summary

Constructors

Constructor	Description
VirtualPredicate()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

condition

protected Fragment3 condition

predicate

protected Fragment2 predicate

Constructor Details

VirtualPredicate

public VirtualPredicate()