Is it possible to define multiple predicates between a subject and object in RDF?

Question

I want to persist a RDF Graph, where the predicates are the property edges and the subjects/predicates are the nodes. Now I want to know if multiple edges between two nodes are possible and legal in the rdf semantic.

As example:

Tom -loves->julia Tom -liveswith->julia

Is this in this form possible? Or would I model this in a different way?

Answer 1

Yes, it's quite possible. It's just two triples. E.g., in Turtle, it might look like:

@prefix : <urn:ex:>.

:Tom :loves :Julia .
:Tom :livesWith :Julia .

or even more concisely:

@prefix : <urn:ex:>.

:Tom :loves :Julia ;
     :livesWith :Julia .

A RDF graph is just a set of triples. There's no constraint on how many of those triples happen to have the same subject and object.

In fact, since RDFS has a subPropertyOf relationship, having multiple relationships between the same resources is pretty much required. E.g., you might have:

:hasSon rdfs:subPropertyOf :hasChild .

That means that when you have

:X :hasSon :Y

you can infer

:X :hasChild :Y

which is another triple that relates the same subject and object.