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Add explicit exceptions to ignoring element semantics with condition … #772

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Jun 5, 2018
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Add explicit exceptions to ignoring element semantics with condition … #772

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43eb94e
Add explicit exceptions to ignoring element semantics with condition …
skynavga May 18, 2018
cbd9ce8
Address comments (https://github.com/w3c/ttml2/pull/772#pullrequestre…
skynavga May 31, 2018
2aa7851
Add term references for 'timed element'; fix a couple of typo/missing…
skynavga May 31, 2018
21fe75a
Merge branch 'master' into issue-0583-condition
skynavga May 31, 2018
1856ffd
Merge branch 'master' into issue-0583-condition
skynavga Jun 5, 2018
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44 changes: 30 additions & 14 deletions spec/ttml2.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -1700,6 +1700,12 @@ active time interval of the feature.</p>
about which see also <specref ref="style-attribute-textOrientation"/>.</p>
</def>
</gitem>
<gitem id="terms-timed-element">
<label>[timed element]</label>
<def>
<p>Any element of a type that permits the specification of a <loc href="#timing-attribute-begin"><att>begin</att></loc> attribute.</p>
</def>
</gitem>
<gitem id="terms-timed-text">
<label>[timed text]</label>
<def>
Expand Down Expand Up @@ -6042,6 +6048,16 @@ attribute that evaluates to <code>false</code>, then the content of that element
<p>In certain cases, ignoring (excluding) the semantics of an element by means of a <att>condition</att> attribute consists
of partially rather than wholly ignoring the semantics of the element, about which see specific element definitions.</p>
</note>

<p>Unless a <loc href="#terms-higher-level-protocol">higher level protocol</loc> applies, the following exceptions apply for the
purpose of determining which semantics are to be ignored when a <loc href="#content-value-condition">&lt;condition&gt;</loc> expression
value evaluates to <code>false</code>:</p>
<ulist>
<item><p>the <loc href="#semantics-timing">timing semantics</loc> of a <loc href="#terms-timed-element">timed element</loc> are not ignored;</p></item>
<item><p>the <loc href="#semantics-style-association-chained-referential">chained referential semantics</loc> of a
<loc href="#styling-vocabulary-style"><el>style</el></loc> element are not ignored;</p></item>
</ulist>

</div3>
<div3 id="content-attribute-xlink-arcrole">
<head>xlink:arcrole</head>
Expand Down Expand Up @@ -6966,7 +6982,7 @@ by a fragment identifier used in a <loc href="#terms-data-binding-context">data
</note>
<p>When a <el>data</el> element appears in a <loc href="#terms-data-binding-context">data binding context</loc>, it
serves as a non-sharable definition of a data resource that implies binding semantics, i.e., that it is intended to bound to (associated with) its immediate context
of reference. In this case, the active time interval of the <el>data</el> element is the same as the active time interval of its closest ancestor timed element.
of reference. In this case, the active time interval of the <el>data</el> element is the same as the active time interval of its closest ancestor <loc href="#terms-timed-element">timed element</loc>.
</p>
<note role="elaboration">
<p>A non-sharable definition of a data resource may or may not specify an <loc href="#content-attribute-xml-id"><att>xml:id</att></loc> attribute, but this
Expand Down Expand Up @@ -17311,19 +17327,19 @@ vocabulary catalog.</p>
</div2> <!-- timing-element-vocabulary -->
<div2 id="timing-attribute-vocabulary">
<head>Timing Attribute Vocabulary</head>
<p>This section defines the following basic timing attributes for use with timed elements:</p>
<p>This section defines the following basic timing attributes for use with <loc href="#terms-timed-element">timed elements</loc>:</p>
<ulist>
<item><p><specref ref="timing-attribute-begin"/></p></item>
<item><p><specref ref="timing-attribute-dur"/></p></item>
<item><p><specref ref="timing-attribute-end"/></p></item>
</ulist>
<p>In addition, this section defines the <specref
ref="timing-attribute-timeContainer"/> attribute for use with timed elements
ref="timing-attribute-timeContainer"/> attribute for use with <loc href="#terms-timed-element">timed elements</loc>
that serve simultaneously as timing containers.</p>
<div3 id="timing-attribute-begin">
<head>begin</head>
<p>The <att>begin</att> attribute is used to specify the begin
point of a temporal interval associated with a timed element. If
point of a temporal interval associated with a <loc href="#terms-timed-element">timed element</loc>. If
specified, the value of a <att>begin</att> attribute must adhere to
a &lt;time-expression&gt; specification as defined by <specref
ref="timing-value-time-expression"/>.</p>
Expand All @@ -17334,15 +17350,15 @@ by <bibref ref="smil3"/>, &sect;5.4.3,
while taking into account any overriding semantics defined by this specification.</p>
<note role="clarification">
<p>As defined by <bibref ref="smil3"/>, &sect;5.4.3,
if no <att>begin</att> attribute is explicitly specified on a timed element, then a default (implicit) value
if no <att>begin</att> attribute is explicitly specified on a <loc href="#terms-timed-element">timed element</loc>, then a default (implicit) value
is determined by the nearest time container ancestor; however, in TTML, that ancestor is either
a parallel time container or a sequential time container, both of which apply a default value of <code>0</code>.</p>
</note>
</div3>
<div3 id="timing-attribute-dur">
<head>dur</head>
<p>The <att>dur</att> attribute is used to specify the duration of a
temporal interval associated with a timed element. If specified,
temporal interval associated with a <loc href="#terms-timed-element">timed element</loc>. If specified,
the value of a <att>dur</att> attribute must adhere to a
&lt;time-expression&gt; specification as defined by <specref
ref="timing-value-time-expression"/>.</p>
Expand Down Expand Up @@ -17371,7 +17387,7 @@ the <att>dur</att> attribute and the difference between the value of the
<div3 id="timing-attribute-end">
<head>end</head>
<p>The <att>end</att> attribute is used to specify the ending point
of a temporal interval associated with a timed element. If
of a temporal interval associated with a <loc href="#terms-timed-element">timed element</loc>. If
specified, the value of an <att>end</att> attribute must adhere to a
&lt;time-expression&gt; specification as defined by <specref
ref="timing-value-time-expression"/>.</p>
Expand Down Expand Up @@ -17582,7 +17598,7 @@ use of the <code>utc</code> clock mode, about which see <specref ref="parameter-
<div2 id="semantics-timing">
<head>Timing Semantics</head>
<p>The semantics of time containment, durations, and intervals defined by
<bibref ref="smil3"/> apply to the interpretation of like-named timed elements and timing
<bibref ref="smil3"/> apply to the interpretation of like-named <loc href="#terms-timed-element">timed elements</loc> and timing
vocabulary defined by this specification, given the following
constraints:</p>
<!--
Expand Down Expand Up @@ -23676,11 +23692,11 @@ M = referenceBegin + 3600 * hours + 60 * minutes + seconds + ((frames + (subFram
<sitem>
where <code>referenceBegin</code> is determined according to whether the nearest ancestor time container employs
parallel (<code>par</code>) or sequential (<code>seq</code>) semantics: if parallel or if sequential and no prior sibling
timed element exists, then <code>referenceBegin</code>
<loc href="#terms-timed-element">timed element</loc> exists, then <code>referenceBegin</code>
is the media time that corresponds to the beginning of the nearest ancestor time container or
zero (0) if this time container is the <loc href="#terms-root-temporal-extent">root temporal extent</loc>; otherwise, if sequential and a prior sibling
timed element exists, then <code>referenceBegin</code> is the media time that corresponds to the active end of the
immediately prior sibling timed element;
<loc href="#terms-timed-element">timed element</loc> exists, then <code>referenceBegin</code> is the media time that corresponds to the active end of the
immediately prior sibling <loc href="#terms-timed-element">timed element</loc>;
</sitem>
<sitem/>
<sitem>
Expand Down Expand Up @@ -23944,11 +23960,11 @@ must be considered to be invalid for purposes of validation assessment.
<sitem>
where <code>referenceBegin</code> is determined according to whether the nearest ancestor time container employs
parallel (<code>par</code>) or sequential (<code>seq</code>) semantics: if parallel or if sequential and no prior sibling
timed element exists, then <code>referenceBegin</code>
<loc href="#terms-timed-element">timed element</loc> exists, then <code>referenceBegin</code>
is the SMPTE time that corresponds to the beginning of the nearest ancestor time container or
zero (0) if this time container is the <loc href="#terms-root-temporal-extent">root temporal extent</loc>; otherwise, if sequential and a prior sibling
timed element exists, then <code>referenceBegin</code> is the SMPTE time that corresponds to the active end of the
immediately prior sibling timed element;
<loc href="#terms-timed-element">timed element</loc> exists, then <code>referenceBegin</code> is the SMPTE time that corresponds to the active end of the
immediately prior sibling <loc href="#terms-timed-element">timed element</loc>;
</sitem>
<sitem/>
</slist>
Expand Down