SPARQL all predicate-object pairs of subject and all its superclasses

Question

Imagine you do something crazy and store your object-oriented model as an RDF graph.

shows a simplified example of the inheritance hierarchy and the associated attributes.

In practice, you get such graph structure if you translate some UML class diagram into RDFS.

The question is: what SPARQL query can deliver all the predicate-object pairs necessary to instantiate a particular resource of "Class C". In other words: how do you get all the predicate-object pairs along the whole inheritance chain (only single inheritance).

hehe.. unfortunately, times of homework are long gone. it's an actual real world problem. — Smartgrid, Sep 13 '16 at 07:19

score 4 · Answer 1 · answered Sep 12 '16 at 18:32

Given this diagram, the predicate-object pairs of all members of the class:ClassC is simply:

SELECT ?inst ?p ?o
WHERE {
   ?inst a :ClassC .
   Inst ?p ?o .

Keep in mind that there is not property inheritance in RDF/RDFS. If you want to find all of property/values pairs for ClassA with entailments for subclasses then useL

SELECT ?inst ?p ?o
WHERE {
   ?cls rdfs:subClassOf* :ClassA .
   ?inst a ?cls .
   ?inst ?p ?o
}

In this respect, RDFS works a bit backwards of one's expectations of OO inheritance.

there is no instance data yet, just the TBox. But you gave me a good idea. `rdfs:subClassOf*` did the job. — Smartgrid, Sep 13 '16 at 07:47

Smartgrid · Accepted Answer · 2016-09-13T08:19:47.827

4

With the info from @scotthenninger the following query did the job:

SELECT ?p ?o
WHERE {
   :ClassC rdfs:subClassOf* ?anySuperClass .
   ?anySuperClass ?p ?o .   
}

edit: Similar query gets all the self-defined properties and their range along the inheritance chain:

SELECT ?prop ?obj
    WHERE {
       :ClassC rdfs:subClassOf* ?anySuperClass .
       ?prop rdfs:domain ?anySuperClass .   
       ?prop rdfs:range ?obj .
}

End results combined:

foo:ID         xsd:string
foo:name       xsd:string
rdfs:comment   xsd:string
foo:similarTo  :ClassD

edited Sep 13 '16 at 08:19

answered Sep 13 '16 at 07:51

Smartgrid

71
7

Good to see that you got some good ideas and was able to solve your problem - please consider voting @scotthenninger 's answer UP (if you found it useful) - then accept your own answer so that the question is marked as answered. Happy coding! – ishmaelMakitla Sep 13 '16 at 07:56
sure, but need +9 reputation to upvote scottheninger – Smartgrid Sep 13 '16 at 08:21
Here's your missing reputation :) – Tomasz Pluskiewicz Sep 13 '16 at 10:31

SPARQL all predicate-object pairs of subject and all its superclasses

2 Answers2