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Informal definition of quad. #12

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Informal definition of quad.
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21 changes: 21 additions & 0 deletions spec/index.html
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Expand Up @@ -816,6 +816,27 @@ <h3>Content Negotiation of RDF Datasets</h3>
the consumer is expected to use the <a data-lt="rdf dataset">RDF dataset's</a> default graph.</p>

</section>

<section id="section-dataset-quad" class="informative">
<h3>Dataset as a set of quads</h3>

<p>A <dfn>quad</dfn> is a conceptual projection of a <a>triple</a> with
either the <a>default graph</a> or a <a>named graph</a>.
A <a>quad</a> is the generalization of a <a>triple</a>
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This is quite different to #5.

The projection (as in "a view of" - c.f. SQL) is the other way round - a triple is the projection of a quad without the graph name component.

In #5, a quad is a triple and an optional graph name.

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I also find the phrasing of the first sentence not so suitable. It is not really clear what a "conceptual projection" is.

My definition would be:

A <dfn>quad</dfn> is a <a>triple</a> associated with an optional <a>graph name</a> and
is used when referring to triples within an <a>RDF dataset</a>.

Using that definition as the first paragraph of the section, as the next paragraph I would put the sentence about "An RDF dataset can be .." (as given in Andy's comment below).

As third paragraph I would then use the following adaptation of the paragraph about quads versus triples.

Although a <a>quad</a> without a graph name consists of the same three components as
a <a>triple</a>, it is a distinct concept, as it specifically captures the notion of
a triple within the <a>default graph</a> of an <a>RDF dataset</a>.

along with an optional <a>graph name</a>,
indicating a named graph containing that <a>triple</a>.
</p>

<p>A <a>quad</a> can be represented as a tuple composed of <a>subject</a>, <a>predicate</a>, <a>object</a>,
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That works because when the text says "subject" it has to be subject of something - the triple.

and an optional <a>graph name</a>.</p>

<p>An <a>RDF dataset</a> can informally be considered to be a set of <a>quads</a>.</p>

<p class="note">Although a <a>quad</a> in the <a>default graph</a> shares
the same components as a <a>triple</a>,
it is a distinct concept, as it is specifically
a triple within the <a>default graph</a> of an <a>RDF dataset</a>.</p>
</section>
</section>

<section id="section-Datatypes">
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