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Update note about datasets and SPARQL #133

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16 changes: 6 additions & 10 deletions spec/index.html
Original file line number Diff line number Diff line change
Expand Up @@ -1012,16 +1012,12 @@ <h2>RDF Datasets</h2>
can avoid interoperability issues by not ascribing importance to
the presence or absence of empty named graphs.</p>

<p>SPARQL 1.2 [[SPARQL12-CONCEPTS]] also defines the concept of an RDF
Dataset. The definition of an RDF Dataset in SPARQL 1.1 and this
specification differ slightly in that this specification allows RDF
Graphs to be identified using either an IRI or a blank node. SPARQL 1.1
Query Language only allows RDF Graphs to be identified using an IRI.
Existing SPARQL implementations might not allow blank nodes to be used
to identify RDF Graphs for some time, so their use can cause
interoperability problems.
<a href="#section-skolemization">Skolemizing</a> blank nodes used as
graph names can be used to overcome these interoperability problems.</p>
<p>SPARQL 1.2 [[SPARQL12-QUERY]] uses
<a data-cite="SPARQL12-QUERY#sparqlDataset">the same concept of an RDF Dataset</a>
where an RDF Graph can be identified using an IRI or a blank node.
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SPARQL 1.1 Query Language [[SPARQL12-QUERY]]
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only allows RDF Graphs to be identified using an IRI.</p>
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</div>

<section id="section-dataset-isomorphism">
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