Hi Dileepa,
thanks for stopping by and welcome on the list!
Your approach for the FILTER EXISTS looks perfectly fine ([rdf:type is $1]
and [is-a $1] are equivallent).
For the negation use the NotFilter := '!(' Filter ')'
in your example that would be
oa:hasBody[ ! (fam:entity-type is skos:Concept) ]
When using negation, please keep in mind that the result of such query
might evaluate incorrectly with respect to the open-world assumption. In
your concrete example, however, I don't see any problem.
Best,
Jakob
Dileepa Jayakody <[email protected]> schrieb am Di., 12. Apr. 2016
um 14:30 Uhr:
> Hi All,
>
> I'm Dileepa, a software developer currently working in a project involving
> semantic web and linked data technologies. We are using Marmotta for linked
> data publishing and querying purposes in the project.
> In the client side, to query linked data we are using anno4j
> <https://github.com/anno4j/anno4j> a Java RDF library conforming to open
> annotation data model which supports LDPath to do data querying.
>
> Following is a sample SPARQL query I'm trying to wrap with anno4j using
> LDPath.
>
>
> PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
> PREFIX mico: <http://www.mico-project.eu/ns/platform/1.0/schema#>
> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX oa: <http://www.w3.org/ns/oa#>
> PREFIX dc: <http://purl.org/dc/elements/1.1/>
> PREFIX dct: <http://purl.org/dc/terms/>
> PREFIX fam: <http://vocab.fusepool.info/fam#>
> PREFIX dbo: <http://dbpedia.org/ontology/>
> SELECT ?id ?body ?p ?o WHERE {
> <http://localhost:8080/43s5-3356-53fd-e338f4653aad> mico:hasContentPart
> ?cp .
> ?cp mico:hasContent ?annot .
> ?annot oa:hasBody ?body .
> ?body ?p ?o
> FILTER EXISTS {?body rdf:type fam:LinkedEntity}
> FILTER NOT EXISTS {?body fam:entity-type skos:Concept }
>
> I can map FILTER EXISTS using: oa:hasBody[is-a fam:LinkedEntity] or
> oa:hasBody[rdf:type is fam:LinkedEntity]
> But I'm having difficulty with the negation filter.
> Any tips on how to map with SPARQL negation using LDPath?
>
> Thanks,
> Dileepa
>
