Thanks a lot Jakob for your help
On Apr 13, 2016 12:09 PM, "Jakob Frank" <[email protected]> wrote:
> 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
> >
>
