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GH-111: Add informative definitions for 'Symmetric RDF'. #113

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GH-111: Add informative definitions for 'Symmetric RDF'. #113

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31 changes: 27 additions & 4 deletions spec/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1381,12 +1381,35 @@ <h2>Fragment Identifiers</h2>
</section>

<section id="section-generalized-rdf" class="informative">
<h2>Generalized RDF Triples, Graphs, and Datasets</h2>
<h2>Generalizations of RDF Triples, Graphs, and Datasets</h2>

<p>It is sometimes convenient to loosen the requirements
on <a>RDF triples</a>. For example, the completeness
of the RDFS entailment rules is easier to show with a
generalization of RDF triples.</p>
of the RDFS entailment rules is easier to show with
symmetric RDF triples.</p>

<p>
A <dfn class="export">symmetric RDF triple</dfn> allows the subject to be
any <a>RDF term</a> that is allowed in the object position, one of
an <a>IRI</a>,
a <a>blank node</a>,
a <a>literal</a>
or a <a>triple term</a>.
A <dfn class="export">symmetric RDF graph</dfn> is a set of symmetric RDF triples.
A <dfn class="export">symmetric RDF dataset</dfn>
comprises a distinguished symmetric RDF graph, and zero
or more pairs each associating an <a>IRI</a>
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or more pairs each associating an <a>IRI</a>
or more pairs each associating an <a>IRI</a> or a <a>blank node</a>

with a symmetric RDF graph.</p>

<p>Symmetric RDF triples, graphs, and datasets differ
from standard normative RDF <a>triples</a>,
<a data-lt="RDF graph">graphs</a>, and
<a data-lt="RDF dataset">datasets</a>
only by allowing <a>IRIs</a>,
<a>blank nodes</a>,
<a>literals</a>,
or <a>triple terms</a>
in the subject and object positions.</p>

<p>A <dfn class="export">generalized RDF triple</dfn> is a triple having a subject,
a predicate, and an object, where each can be an <a>IRI</a>, a
Expand Down Expand Up @@ -1414,7 +1437,7 @@ <h2>Generalized RDF Triples, Graphs, and Datasets</h2>
in any position, i.e., as subject, predicate, object, or graph name.</p>

<p class="note" id="note-generalized-rdf">Any user of
generalized RDF triples, graphs, or datasets needs to be
symmetric or generalized RDF triples, graphs, or datasets needs to be
aware that these notions are non-standard extensions of
RDF, and their use may cause interoperability problems.
There is no requirement for any RDF tool to
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