gkellogg
commented
3 years ago I looked into this, and it's a bit more complicate with RDF/XML. The rdf:ID attribute can be used on either Node Elements or Property Elements.
On Node elements, it creates a subject based on a fragment identifier in the main document, so that ID="foo" is pretty much the same as about="#foo".
On Property elements, it is the identifier of the reified statement composed of the established subject, the property identified by the element, and the object value.
Because a statement using the same identifier as a subject can be separate from the use of that identifier for the reified statement, to get the same affect as Turtle-star, you'd need to post-process the resulting graph in order to eliminate the use of the fragment identifier as a subject or object of some other statement. Easiest would be to replace the reification with an owl:sameAs to link the fragment to an embedded triple.
For example, consider the following:
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:ex="http://example.org/"
xml:base="http://example.org/">
<rdf:Description rdf:about='http://example.org/employee38'>
<ex:familyName>Smith</ex:familyName>
<ex:jobTitle rdf:ID="stmt">Assistant Designer</ex:jobTitle>
</rdf:Description>
<rdf:Description rdf:ID="stmt">
<ex:accordingTo rdf:resource='http://example.org/employee22'/>
</rdf:Description>
</rdf:RDF>This might be represented by Turtle-star as in example 2:
@prefix : <http://www.example.org/> .
:employee38
:familyName "Smith" ;
:jobTitle "Assistant Designer" {| :accordingTo :employee22 |} .To get the same affect by parsing RDF/XML-star, you'd need to separately connect the use of "smnt" to identify the reified statement and to describe the accordingTo statement. Because they can be separated in space (and may not be used at all), it becomes a post-processing problem.
Instead, we could consider retaining "stmt" and creating an owl:sameAs equivalence:
@prefix : <http://www.example.org/> .
:employee38
:familyName "Smith" ;
:jobTitle "Assistant Designer" .
:stmt owl:sameAs <<:employee38 :jobTitle "Assistant Designer">>;
:accordingTo :employee22 .This would reasonably preserve the semantics, but doesn't really create an equivalence with Turtle-star or the others.
ericprud
pchampin
afs
I was wondering if we could have an rdf-star interpretation of reifying shorthand in RDF/XML.
Where the contents of the rdf:ID field can be disregarded and it's uses to be a "temporary name" for an asserted and embedded triple.