Custom properties for no SPARQL LOD scenario

Dear all,

I'm involved in a new modelling versión of UNESCO Thesaurus. The current is
at http://skos.um.es/unescothes

The integration of this vocabulary into Linked Open Data enviroment it's a
bit difficult. The main reason for this is that there is serveral
situations in which the request of a SKOS resource deliver incomplete
information about the real structure of a KOS.

Case 1

<COL> rdf:type  skos:Collection;
    skos:member  <Concept_A> .

<Concept_A>  rdf:type  skos:Concept .

With a direct request to <Concept_A> it's impossible to know the
collections <Concept_A> belong to.


Case 2

Other issue is the location of access points to a concept collection.
Sometimes modelling micro-thesaurus as skos:Collection has been suggested.
But, How can be possible identify access points (Top Concepts) into a
skos:Collection? The recommendation set skos:ConceptScheme as the domain of
skos:hasTopConcept (same for range of skos:topConceptOf).


Certainly, an SPARQL Endpoint could solve both issues:

For Case 1:

SELECT ?col WHERE {
?col skos:member <Concept_A> .
}

For Case 2:

SELECT ?topcol WHERE {
?concept skos:topConceptOf ?scheme .
?col skos:member ?concept .
}

But the scenario that I propose don't have an SPARQL Endpoint. Only
directly request to SKOS resorce from a RDF Client, dereferencing URI
resource, with content negotiation and follow the SKOS properties to
discover links with other resources of the same KOS. I repeat: NO SPARQL
AVALAIBLE.

For this reason, we had develop a set of custom properties to solve all
this and obtain an adecuate modelling. I attach the RDF/OWL file.
Personally, I do not like to develop this kind of solution, but there isn't
suitable properties in the SKOS recommendation to solve the issues in the
posed scenario.

We want to know your opinion and suggestions on our work.

Thanks in advance and Regards,
Juan

-- 
Juan Antonio Pastor Sánchez, Ph.D.
Dep. of Information and Documentation
Faculty of Communication and Documentation
University of Murcia
phone: +34 868 88 7252
http://webs.um.es/pastor
pastor@um.es