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GH-284: Align TRIPLE and expression <<( )>> #285

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GH-284: Align TRIPLE and expression <<( )>> #285

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GH-284: Align TRIPLE and expression <<( )>>
afs Sep 11, 2025
b330f2e
Update spec/index.html
afs Sep 11, 2025
11780fa
CONSTRUCT omits symmetric-only triples
afs Sep 11, 2025
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31 changes: 16 additions & 15 deletions spec/index.html
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Expand Up @@ -7824,24 +7824,25 @@ <h5>TRIPLE</h5>
<span class="operator">&lt;&lt;(</span> subj pred obj <span class="operator">)&gt;&gt;</span>
</pre>
<p>
If the 3-tuple (<code style="color:black">subj</code>,
Create a <a data-cite="RDF12-CONCEPTS#dfn-triple-term">triple term</a> from
<a data-cite="RDF12-CONCEPTS#dfn-rdf-term">RDF terms</a>
<code style="color:black">subj</code>,
<code style="color:black">pred</code>,
<code style="color:black">obj</code>)
is an <a data-cite="RDF12-CONCEPTS#dfn-rdf-triple">RDF triple</a>
(that is, <code style="color:black">subj</code> is an
<a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a> or
<a data-cite="RDF12-CONCEPTS#dfn-blank-node">blank node</a>;
<code style="color:black">pred</code> is an
<a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>;
and <code style="color:black">obj</code> is an
<a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>,
<a data-cite="RDF12-CONCEPTS#dfn-triple-term">triple term</a>,
<a data-cite="RDF12-CONCEPTS#dfn-blank-node">blank node</a> or
<a data-cite="RDF12-CONCEPTS#dfn-literal">literal</a>)
the function returns a triple term with these three elements.
and <code style="color:black">obj</code>,
where the predicate is
<a data-cite="RDF12-CONCEPTS#dfn-iri">IRI</a>.
Otherwise, the function raises an error.
</p>

<p class="note">
This allows triples to be
<a data-cite="RDF12-CONCEPTS#dfn-symmetric-rdf-triple">symmetric RDF triples</a>
as corresponding to <a href="#sparqlTriplePatterns">SPARQL triple patterns</a>.
The graph result from a
<a href="#constructGraph">CONSTRUCT</a> query form
allows <a data-cite="RDF12-CONCEPTS#dfn-rdf-triple">RDF triples</a>, and not
their germalization to
<a data-cite="RDF12-CONCEPTS#dfn-symmetric-rdf-triple">symmetric RDF triples</a>.
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Maybe state that the generalized triples are discarded by CONSTRUCT? The sentence sounded a bit weird to me, stating the issue but not telling what is the expected behavior.

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Good idea.

</p>
<p>
As a shorthand notation, the <code>TRIPLE</code> function
can also be written in the form of a
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