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[css-namespaces] Restore Terminology section #1387

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May 31, 2017
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[css-namespaces] Restore Terminology section #1387

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28 changes: 28 additions & 0 deletions css-namespaces/Overview.bs
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Expand Up @@ -61,6 +61,34 @@ Introduction</h2>
rather than possibly match them incorrectly.


<h3 id="terminology">
Terminology</h3>

Besides terms introduced by this specification,
CSS Namespaces uses the terminology defined in Namespaces in XML 1.0. [[!XML-NAMES]]
However, the syntax defined here is not restricted to representing XML element and attribute names
and may represent other kinds of namespaces as defined by the host language.

In CSS Namespaces a namespace name consisting of the empty string
is taken to represent the null namespace
or lack of a namespace.

<div class="example">
For example, given the namespace declarations:

<pre>
@namespace empty "";
@namespace "";
</pre>

The <a>type selectors</a>
<code>elem</code>,
<code>|elem</code>,
and <code>empty|elem</code>
are equivalent.
</div>


<h2 id="declaration">Declaring namespaces: the ''@namespace'' rule</h2>

The ''@namespace'' <a>at-rule</a> declares a namespace prefix
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