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Clarify requirements for Represents #328

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Clarify requirements for Represents #328

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30 changes: 21 additions & 9 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1406,6 +1406,12 @@ <h4>Text</h4>
is indicated using the <a>Text Language Source</a> property.</p>
<p>If the <a>Text</a> object, or part of it, represents something more specific, or different,
to its parent <a>Script Event</a>, it can have a different <a>Represents</a> property.</p>
<p>The <a>Text</a> object, and every one of its parts, MUST have a valid <a>Represents</a> property.
The presence of the property itself is considered optional
because if the <a>Text</a> object omits the
property then the property is inherited from the parent <a>Script Event</a>.
However it is an error for a <a>Text</a> object to specify an invalid <a>Represents</a> property.
</p>
<aside class="note">
<p>Where possible, text representing
different parts of the <a>related media object</a> should be put into
Expand Down Expand Up @@ -2268,25 +2274,25 @@ <h3>Namespaces</h3>
<!-- TTML Namespaces are ordered the same as in the TTML2 Specification -->
<tr>
<td>TT</td>
<td><code>tt</code></td>
<td><dfn class="lint-ignore"><code>tt</code></dfn></td>
<td><code>http://www.w3.org/ns/ttml</code></td>
<td>[[TTML2]]</td>
</tr>
<tr>
<td>TT Parameter</td>
<td><code>ttp</code></td>
<td><dfn class="lint-ignore"><code>ttp</code></dfn></td>
<td><code>http://www.w3.org/ns/ttml#parameter</code></td>
<td>[[TTML2]]</td>
</tr>
<tr>
<td>TT Audio Style</td>
<td><code>tta</code></td>
<td><dfn class="lint-ignore"><code>tta</code></dfn></td>
<td><code>http://www.w3.org/ns/ttml#audio</code></td>
<td>[[TTML2]]</td>
</tr>
<tr>
<td>TT Metadata</td>
<td><code>ttm</code></td>
<td><dfn><code>ttm</code></dfn></td>
<td><code>http://www.w3.org/ns/ttml#metadata</code></td>
<td>[[TTML2]]</td>
</tr>
Expand All @@ -2298,7 +2304,7 @@ <h3>Namespaces</h3>
</tr>
<tr>
<td>DAPT Metadata</td>
<td><code>daptm</code></td>
<td><dfn class="export"><code>daptm</code></dfn></td>
<td><code>http://www.w3.org/ns/ttml/profile/dapt#metadata</code></td>
<td><em>This specification</em></td>
</tr>
Expand All @@ -2310,7 +2316,7 @@ <h3>Namespaces</h3>
</tr>
<tr>
<td>EBU-TT Metadata</td>
<td><code>ebuttm</code></td>
<td><dfn class="lint-ignore"><code>ebuttm</code></dfn></td>
<td><code>urn:ebu:tt:metadata</code></td>
<td>[[EBU-TT-3390]]</td>
</tr>
Expand Down Expand Up @@ -2694,12 +2700,18 @@ <h3>Handling <code>&lt;div&gt;</code> and <code>&lt;p&gt;</code> elements</h3>
<p>The following processing rules resolve these cases.</p>
<p>Rules for identifying <a>Script Events</a>:</p>
<ol>
<li>A <code>&lt;div&gt;</code> element that has no <code>&lt;div&gt;</code> element children
and includes the TTML representations of all the mandatory properties of a <a>Script Event</a>
<li>
<p>A <code>&lt;div&gt;</code> element that has no <code>&lt;div&gt;</code> element children
and includes the TTML representations of all the non-metadata mandatory properties of a <a>Script Event</a>
MUST be mapped to a <a>Script Event</a>,
such as having a valid <code>xml:id</code>
representing the <a>Script Event Identifier</a>,
even if it also contains additional <a>unrecognised vocabulary</a>;</li>
even if it also contains additional <a>unrecognised vocabulary</a>;</p>
<aside>For the purposes of this clause a property is considered to be
metadata if its TTML representation is in the <a><code>daptm</code></a> namespace
or the <a><code>ttm</code></a> namespace.
</aside>
</li>
<li>A <code>&lt;div&gt;</code> element that contains any <code>&lt;div&gt;</code> element children
MUST NOT be mapped to a <a>Script Event</a>;
the processor instead MUST iterate through those <code>&lt;div&gt;</code> element children
Expand Down