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Merge pull request #84 from gkellogg/gkellogg-rdfa-update
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Simplify RDFa algorithm as per Ruby Microdata to RDF implementation.
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@chaals
chaals committed Dec 13, 2017
2 parents 2855c41 + b99227a commit ef6f954
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60 changes: 32 additions & 28 deletions index.html
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Expand Up @@ -1489,37 +1489,41 @@ <h3>RDFa</h3>
the triples produced by applying the following algorithm:</p>

<ol>
<li>Replace the <a>itemscope</a> attribute with a <code>vocab</code> attribute,
whose value is the <a>vocabulary identifier</a> for the item.</li>
<li>Let <var>local type</var> be the difference between the <a>vocabulary identifier</a> and the first
value of <a>itemtype</a>. Replace the <a>itemtype</a> attribute with a <code>typeof</code> attribute
whose value is <var>local type</var>.</li>
<li>If <a data-lt="split a string on spaces">splitting the value on spaces</a> for the <a>itemtype</a> attribute
results in more than one value,
then for each value <var>extra type</var> of <a>itemtype</a> after the first,
add an empty <code>span</code> child element to the element that represents the item,
with the attribute <code>rel="rdf:type"</code>
and a <code>resource</code> attribute whose value is <var>extra type</var>.</li>
<li>Change each <a>itemprop</a> attribute to a <code>property</code> attribute with the same value</li>
<li>Change each <a>itemid</a> attribute to a <code>resource</code> attribute with the same value</li>
<li>For the value of each <a>itemref</a> attribute, for each value <var>reference</var>
that is a result of <a data-lt="split a string on spaces">splitting the value on spaces</a> follow the following substeps:
<li>For each element having an <a>itemscope</a> attribute:
<ol>
<li>Add an element as the immediate parent of the element with <code>id</code> <var>reference</var>,
with a <code>vocab</code> attribute whose value is the <a>vocabulary identifier</a> for the item.
<p class="note">The choice of element is left to the author, to provide sufficient flexibility
to avoid unwanted changes in the rendering of the content.</p>
<li>Replace the <a>itemscope</a> attribute with a <code>vocab</code> attribute, whose value is the <a>vocabulary identifier</a> for the item.</li>
<li>Replace any <a>itemtype</a> attribute with a <code>typeof</code> attribute whose value is taken from the values of <a>itemtype</a> where each type is made relative to <a>vocabulary identifier, ensuring that the element has a <code>typeof</code> attribute with at least an empty value.</a>.
</li>
<li>If the element with <code>id</code> <var>reference</var> has no <code>resource</code> attribute,
add a <code>resource</code> attribute whose value is a NUMBER SIGN U+0023 followed by <var>reference</var>
to the element.</li>
<li>If the element with <code>id</code> <var>reference</var> has no <code>typeof</code> attribute,
add a <code>typeof="rdfa:Pattern"</code> attribute to the element.</li>
<li>Add a <code>link</code> child element to the element that represents the <a>item</a>,
with a <code>rel="rdfa:copy"</code> attribute and an <code>href</code> attribute
whose value is a NUMBER SIGN U+0023 followed by <var>reference</var></li>
<li>Replace any <a>itemid</a> attribute with a
<code>resource</code> attribute having the same value.</li>
<li>Otherwise, ensure that element has a <code>typeof</code>
attribute with at least an empty value.</li>
</ol>
</li>
<li>For each <code>object</code> element having both an
<a>itemprop</a> and a <code>data</code> attribute, change
the <code>data</code> attribute to a
<code>resource</code> attribute with the same value</li>
<li>Change each <a>itemprop</a> attribute to a <code>property</code> attribute with the same value</li>
<li>For each element having an <a>itemref</a> attribute:
<ol>
<li>Set <var>item vocab</var> to the first value of the
<code>vocab</code> attribute taken from the element and its
ansestors.</li>
<li>For each value <var>reference</var>
that is a result of <a data-lt="split a string on spaces">splitting the value on spaces</a> follow the following substeps:
<ol>
<li>Add an element as the immediate parent of the element with <code>id</code> <var>reference</var>,
with a <code>vocab</code> attribute whose value is <var>item vocab</var>, and a <code>typeof</code> attribute with <code>rel="rdfa:Pattern"</code> attribute.
<p class="note">The choice of element is left to the author, to provide sufficient flexibility
to avoid unwanted changes in the rendering of the content.</p>
</li>
<li>Add a <code>link</code> child element to the element that represents the <a>item</a>,
with a <code>rel="rdfa:copy"</code> attribute and an <code>href</code> attribute
whose value is a NUMBER SIGN U+0023 followed by <var>reference</var></li>
</ol>
<p>And then remove the </a>itemref</a> attribute.</li>
</ol>
<p>And then remove the </a>itemref</a> attribute.</li>
</ol>

<p class="note">There is significant scope for optimising this algorithm, which may result in redundant <code>vocab</code>
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