duplicate triples/arcs?

report=Are the seemingly duplicate arc and the duplicate triple
correct?

I thought that reading duplicate specifications of a triple
(in a concrete form, e.g., RDF/XML) resulted in only one
copy of the triple (in the abstract graph).


RDF Concepts... section 3.1 says, "A set of such triples
is called an RDF graph..."

However, that doesn't quite say that all RDF graphs are _only_ sets  (vs. a non-set, i.e., with duplicates), and
doesn't define identity of triples.

Section 6.2 does address the first part, saying that a
graph is only a set of triples.

I haven't found anything in the spec that explicitly
addressed the identity of triples.

However, doesn't the identity of a triple depend on only
the identity of the three things in the triple and the
order in which they appear in the triple?

If that is correct, then the graph should not have two
arcs that have the same combination of subject, predicate,
and object, right?


RDF=<?xml version="1.0">
<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:dc="http://purl.org/dc/elements/1.1/">
   <rdf:Description rdf:about="http://www.w3.org/">
     <dc:creator>
       <rdf:Description rdf:about="http://someone" />
     </dc:creator>
     <dc:creator>
       <rdf:Description rdf:about="http://someone" />
     </dc:creator>
   </rdf:Description>
</rdf:RDF>



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