SPIN API: Support for negated property paths

[Robin Keskisärkkä]

Hi!

I need to store negated property paths using the SPIN API (), however, although ARQ parses the queries just fine I'm unable to use them to create SPIN queries. I'm using the latest version of the SPIN API (2.0.0). To exemplify:

# Using negated paths to mimic wildcard
String qString = "PREFIX : <http://example#> SELECT ?target WHERE { :start (:|!:)* ?target }";
Query query = QueryFactory.create(qString);

ARQ2SPIN arq2SPIN = new ARQ2SPIN(model);
org.topbraid.spin.model.Query spinQuery = arq2SPIN.createQuery(query, null);

This gives rise to the exeption:

Exception in thread "main" java.lang.IllegalArgumentException: Unsupported Path element: !<http://example#> of type class org.apache.jena.sparql.path.P_NegPropSet
 at org.topbraid.spin.arq.ARQ2SPIN.createPath(ARQ2SPIN.java:798)
 at org.topbraid.spin.arq.ARQ2SPIN.createPath(ARQ2SPIN.java:769)
 at org.topbraid.spin.arq.ARQ2SPIN.createMod(ARQ2SPIN.java:804)
 at org.topbraid.spin.arq.ARQ2SPIN.createPath(ARQ2SPIN.java:741)
 at org.topbraid.spin.arq.ARQ2SPIN.access$200(ARQ2SPIN.java:130)
 at org.topbraid.spin.arq.ARQ2SPIN$1.visitElements(ARQ2SPIN.java:609)
 at org.topbraid.spin.arq.ARQ2SPIN$1.visit(ARQ2SPIN.java:552)
 at org.apache.jena.sparql.syntax.ElementPathBlock.visit(ElementPathBlock.java:89)
 at org.topbraid.spin.arq.AbstractElementVisitor.visit(AbstractElementVisitor.java:82)
 at org.topbraid.spin.arq.ARQ2SPIN$1.visit(ARQ2SPIN.java:498)
 at org.apache.jena.sparql.syntax.ElementGroup.visit(ElementGroup.java:120)
 at org.topbraid.spin.arq.ARQ2SPIN.createElementList(ARQ2SPIN.java:454)
 at org.topbraid.spin.arq.ARQ2SPIN.createQuery(ARQ2SPIN.java:905)

Are negated property paths not supported in SPIN API at this point? I also looked at the vocabulary specification and couldn't find anything that indicated that it is supported.  

Cheers,

Robin

[Holger Knublauch]

Hi Robin,

negated property paths are currently not supported by the SPIN RDF syntax. I did not even know they existed, having relied on

    https://www.w3.org/TR/sparql11-property-paths/

when designing and updating the SPIN RDF syntax. At some stage, the ! operator was added to SPARQL 1.1 and SPIN was not updated accordingly.

    https://www.w3.org/TR/sparql11-query/#propertypaths

The work-around is to use the syntax based on sp:text instead of the SPIN RDF syntax.

Thanks
Holger

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[Robin Keskisärkkä]

Thank, I'll use the sp:text workaround.

Cheers,

Robin