Here's some context. I need to walk an object hierarchy when the
parent/child relationships are not always the same. Here's a contrived
example. Notice the direction of the arrows
United States <- gn:parentFeature <- New York <- gn:parentFeature <- Kings
County -> v:hasOrganizationUnit -> Walmart -> v:hasOrganizationalUnit ->
Walmart Pharmacy -> :locatedAt -> Aisle 2 -> :locatedAt -> Shelf 3
I want to set things up so given a URI, I can get a list of the ancestors.
So if I called GetAncestors(Walmart Pharmacy) I would get Walmart, Kings
County, New York, United States. Or if I called it on Shelf 3, I would
start there and work my way to United States.
I've identified two things that are making this challenging:
1.) inconsistent parent/child predicate. In some ontology it might be
hasOrganizationalUnit and in another it might be locatedAt.
2.) Inconsistent direction for the hierarchy. So in some it might be a
narrower and in another it's a broader relationship.
I was playing around with one idea:
make gn:parentFeature a rdfs:subPropertyOf skos:broader.
This allows me to make this kind of query:
SELECT *
WHERE {
?narrowerPredicate rdfs:subPropertyOf* skos:narrower .
?broader ?narrowerPredicate ?narrower . # Cannot use ?narrowerPredicate*
}
But, I cannot use property paths on variables (is there a way to do this?)
so I can't 'walk' the object hierarchy.
This also still leaves me with the trouble of walking the hierarchy when
the relationships suddenly change to a broader type.
I'm open to extending these ontologies to make queries easier, but the
objective is to have a very generic query that handles this. Is it
possible?
Thank you!
Bart Petersen
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