I have an objectProperty hierarchy. At a certain level of it, there is a sub-property X, which has its own sub-properties, let's say X1 and X2 one level below it. The actual property assertions are made using X1 and X2. However, I am querying with select * {?s :X ?o} to get them all. What I would want to get also is the IRI of the concrete X descendant that was used in the assertion.

Is this achievable, and how?

[Update 01.07] Just a demo:

@prefix : <http://test/demo#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

:x {
    :X a owl:ObjectProperty.
    :X1 a owl:ObjectProperty ; rdfs:subPropertyOf :X .
    :X11 a owl:ObjectProperty; rdfs:subPropertyOf :X1 .
    :X12 a owl:ObjectProperty; rdfs:subPropertyOf :X1 .

    :o1 a owl:Thing.
    :o2 a owl:Thing.

    :o1 :X11 owl:Thing.
    :o2 :X12 owl:Thing.
}

Queries:

1)

prefix : <http://test/demo#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT * FROM :x {?s :X ?o}

With reasoning on returns the facts, but no clue about the assertions. With reasoning off, returns nothing, as expected. @ValerioCocchi this is not good for me.

2)

prefix : <http://test/demo#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select * FROM :x {?p rdfs:subPropertyOf* :X . ?s ?p ?o}

With reasoning off, return the information needed. @UninformedUser, thank you!