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[ttml2] add support for generic condition attribute
authorGlenn Adams <glenn@skynav.com>
Tue, 25 Nov 2014 18:56:47 -0700
changeset 776 0933a6108611
parent 775 0b2934ddb6fe
child 777 752822fc4b45
[ttml2] add support for generic condition attribute
ttml2/spec/rnc/schema.zip
ttml2/spec/rnc/ttml2-core-attribs.rnc
ttml2/spec/ttml2.xml
ttml2/spec/xsd/schema.zip
ttml2/spec/xsd/ttml2-core-attribs.xsd 
Binary file ttml2/spec/rnc/schema.zip has changed
--- a/ttml2/spec/rnc/ttml2-core-attribs.rnc	Tue Nov 25 14:05:47 2014 -0700
+++ b/ttml2/spec/rnc/ttml2-core-attribs.rnc	Tue Nov 25 18:56:47 2014 -0700
@@ -2,6 +2,9 @@
 # TTML2 Core Attributes Module ..........................................
 # .......................................................................
 
+TTAF.condition.attrib
+  = attribute condition { string }?
+
 TTAF.id.attrib
   = attribute xml:id { xsd:ID }?
 
@@ -18,12 +21,14 @@
   = empty
 
 TTAF.Core.attrib.class &=
+  TTAF.condition.attrib,
   TTAF.id.attrib,
   TTAF.lang.attrib,
   TTAF.space.attrib,
   TTAF.Core.extra.attrib
 
 TTAF.Core.required.attrib.class &=
+  TTAF.condition.attrib,
   TTAF.id.attrib,
   TTAF.lang.required.attrib,
   TTAF.space.attrib,
--- a/ttml2/spec/ttml2.xml	Tue Nov 25 14:05:47 2014 -0700
+++ b/ttml2/spec/ttml2.xml	Tue Nov 25 18:56:47 2014 -0700
@@ -843,11 +843,12 @@
 an <loc href="#profile-vocabulary-feature"><el>ttp:feature</el></loc> element.</p>
 </def>
 </gitem>
-<gitem id="terms-fragment-identifier">
-<label>[fragment identifier]</label>
-<def>
-<p>A syntactic expression that adheres to the fragment identifer syntax defined by <bibref ref="uri"/>,
-Section 4.1.</p>
+<gitem id="terms-forced-subtitle">
+<label>[forced subtitle]</label>
+<def>
+<p>A subtitle (or caption) that is intended to always be displayed even if subtitles (captions) are not enabled. Forced subtitles (captions)
+are used to prevent open captioning of, i.e., burning in, subtitles (captions) related to foreign or alien language or translation of text
+that appears in media, such as in a sign.</p>
 </def>
 </gitem>
 <gitem id="terms-font-defining-context">
@@ -865,6 +866,13 @@
 process include the computed values of font related properties, the capabilities of individual fonts, and the text content being presented.</p>
 </def>
 </gitem>
+<gitem id="terms-fragment-identifier">
+<label>[fragment identifier]</label>
+<def>
+<p>A syntactic expression that adheres to the fragment identifer syntax defined by <bibref ref="uri"/>,
+Section 4.1.</p>
+</def>
+</gitem>
 <gitem id="terms-image-defining-context">
 <label>[image defining context]</label>
 <def>
@@ -1647,7 +1655,7 @@
 referenced schemas may result in a <emph>false positive</emph> indication of validity.
 For example, both the RNC and XSD schemas specify
 that a <att>tts:fontFamily</att> attribute must
-satisfy the <code>xs:string</code> XSD data type; however, this data type is a superset
+satisfy the <code>xsd:string</code> XSD data type; however, this data type is a superset
 of the values permitted to be used with the <att>tts:fontFamily</att> attribute.</p>
 <p>In addition, the RNC schema may produce a <emph>false negative</emph>
 indication of validity when using the <att>xml:id</att> attribute with an element in
@@ -4783,6 +4791,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;tt
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#style-attribute-extent">tts:extent</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang"><phrase role="reqattr">xml:lang</phrase></loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -4868,6 +4877,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;head
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -4907,6 +4917,7 @@
 &lt;body
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#layout-attribute-region">region</loc> = IDREF
@@ -4999,6 +5010,7 @@
 &lt;div
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#layout-attribute-region">region</loc> = IDREF
@@ -5067,6 +5079,7 @@
 &lt;p
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#layout-attribute-region">region</loc> = IDREF
@@ -5143,6 +5156,7 @@
 &lt;span
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#layout-attribute-region">region</loc> = IDREF
@@ -5194,6 +5208,7 @@
 &lt;br
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#layout-attribute-region">region</loc> = IDREF
@@ -5232,23 +5247,31 @@
 <p>This section defines the following common attributes used with many or all element types
 in the core vocabulary catalog:</p>
 <ulist>
+<item><p><specref ref="content-attribute-condition"/></p></item>
 <item><p><specref ref="content-attribute-id"/></p></item>
 <item><p><specref ref="content-attribute-lang"/></p></item>
 <item><p><specref ref="content-attribute-space"/></p></item>
 </ulist>
+<div3 id="content-attribute-condition">
+<head>condition</head>
+<p>The <att>condition</att> attribute is used to conditionally exclude an element from semantic processing.</p>
+<p>The <att>condition</att> attribute may be used with any element in the core vocabulary catalog
+except profile matter, i.e., elements of the <loc href="#element-vocab-type-profile">Profile Module</loc>.</p>
+<p>The value of a <att>condition</att> attribute must adhere to a
+<loc href="#content-value-condition">&lt;condition&gt;</loc> expression.</p>
+<p>For the purpose of presentation processing, if an element specifies a <att>condition</att> attribute, and the
+its <loc href="#content-value-condition">&lt;condition&gt;</loc> expression value evaluates to <code>false</code>,
+then the semantics of the element must be ignored.</p>
+<note role="elaboration">
+<p>For example, if a <loc href="#content-vocabulary-p"><el>p</el></loc> element specifies a <att>condition</att>
+attribute that evaluates to <code>false</code>, then the content of that element is ignored for presentation purposes.</p>
+</note>
+</div3>
 <div3 id="content-attribute-id">
 <head>xml:id</head>
 <p>The <att>xml:id</att> attribute is used as defined by
 <bibref ref="xmlid"/>.</p>
-<p>The <att>xml:id</att> attribute may be used with any element in the
-core vocabulary catalog.</p>
-<ednote>
-<name>Deprecating xml:id in favor of unqualified id</name>
-<date>2013-09-05</date>
-<edtext>Consider deprecating <att>xml:id</att>, using unqualified <att>id</att> instead. If deprecated, then require
-a document to only use <att>xml:id</att> or <att>id</att>, i.e., mixed use to be prohibited. See
-<loc href="https://www.w3.org/AudioVideo/TT/tracker/issues/205">Issue 205</loc>.</edtext>
-</ednote>
+<p>The <att>xml:id</att> attribute may be used with any element in the core vocabulary catalog.</p>
 </div3>
 <div3 id="content-attribute-lang">
 <head>xml:lang</head>
@@ -5316,6 +5339,367 @@
 </note>
 </div3>
 </div2> <!-- content-attribute-vocabulary -->
+<div2 id="content-value-expressions">
+<head>Content Value Expressions</head>
+<p>Core vocabulary may make use of the following expressions:</p>
+<ulist>
+<item><p><specref ref="content-value-arguments"/></p></item>
+<item><p><specref ref="content-value-bound-parameter"/></p></item>
+<item><p><specref ref="content-value-condition"/></p></item>
+<item><p><specref ref="content-value-condition-function"/></p></item>
+<item><p><specref ref="content-value-expression"/></p></item>
+<item><p><specref ref="content-value-media-function"/></p></item>
+<item><p><specref ref="content-value-parameter-function"/></p></item>
+<item><p><specref ref="content-value-quoted-string"/></p></item>
+<item><p><specref ref="content-value-supports-function"/></p></item>
+</ulist>
+
+<div3 id="content-value-arguments">
+<head>&lt;arguments&gt;</head>
+<p>A &lt;arguments&gt; value is a sub-expression used with a <code>function-expression</code> non-terminal of an
+<loc href="#content-value-expression">&lt;expression&gt;</loc> value.</p>
+<table id="arguments-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;arguments&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;arguments&gt;
+  : "(" ")"
+  | "(" argument-list ")"
+
+argument-list
+  : <loc href="#content-value-expression">&lt;expression&gt;</loc>
+  | argument-list "," <loc href="#content-value-expression">&lt;expression&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+</div3>
+
+<div3 id="content-value-bound-parameter">
+<head>&lt;bound-parameter&gt;</head>
+<p>A &lt;bound-parameter&gt; value is one of an enumerated collection of named parameters bound to a value by the
+<loc href="#terms-content-processor">content processor</loc>.</p>
+<table id="bound-parameter-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;bound-parameter&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;bound-parameter&gt;
+  : forced
+  | mediaAspectRatio
+  | mediaLanguage
+  | userLanguage
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<glist>
+<gitem id="bound-parameter-forced">
+<label><code>forced</code></label>
+<def>
+<p>Evaluates to a boolean value that denotes if the <loc href="#terms-content-processor">content processor</loc> is operating with
+<loc href="#terms-forced-subtitle">forced subtitles</loc> enabled.</p>
+</def>
+</gitem>
+<gitem id="bound-parameter-mediaAspectRatio">
+<label><code>mediaAspectRatio</code></label>
+<def>
+<p>Evaluates to a numeric value equal to the aspect ratio of the <loc href="#terms-related-media-object">related media object</loc>.</p>
+</def>
+</gitem>
+<gitem id="bound-parameter-mediaLanguage">
+<label><code>mediaLanguage</code></label>
+<def>
+<p>Evaluates to a string value equal to the (primary) language of the <loc href="#terms-related-media-object">related media object</loc>.</p>
+</def>
+</gitem>
+<gitem id="bound-parameter-userLanguage">
+<label><code>userLanguage</code></label>
+<def>
+<p>Evaluates to a string value equal to the (primary) language of the user as determined by the
+<loc href="#terms-document-processing-context">document processing context</loc>.</p>
+</def>
+</gitem>
+</glist>
+</div3>
+
+<div3 id="content-value-condition">
+<head>&lt;condition&gt;</head>
+<p>A &lt;condition&gt; value is used to specify an expression that evaluates to a binary value
+which is used to determine if the semantics of a
+<loc href="#terms-conditionalized-element">conditionalized element</loc> is respected or ignored during content processing.</p>
+<table id="condition-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;condition&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;condition&gt;
+  : <loc href="#content-value-expression">&lt;expression&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<p>If a &lt;condition&gt; value contains a <code>function-expression</code> non-terminal, then it must take the form
+of a <loc href="#content-value-condition-function">&lt;condition-function&gt;</loc> expression.</p>
+</div3>
+
+<div3 id="content-value-condition-function">
+<head>&lt;condition-function&gt;</head>
+<p>A &lt;condition-function&gt; value is a sub-expression that may be used in a <loc href="#content-value-condition">&lt;condition&gt;</loc> value expression.</p>
+<table id="condition-function-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;condition-function&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;condition-function&gt;
+  | <loc href="#content-value-media-function">&lt;media-function&gt;</loc>
+  | <loc href="#content-value-parameter-function">&lt;parameter-function&gt;</loc>
+  | <loc href="#content-value-supports-function">&lt;supports-function&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+</div3>
+
+<div3 id="content-value-expression">
+<head>&lt;expression&gt;</head>
+<p>An &lt;expression&gt; value is a sub-expression of a <loc href="#content-value-condition">&lt;condition&gt;</loc> value.</p>
+<table id="expression-value-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;expression&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;expression&gt;
+  : logical-or-expression
+
+logical-or-expression
+  : logical-and-expression
+  | logical-or-expression "||" logical-and-expression
+
+logical-and-expression
+  : equality-expression
+  | logical-and-expression "&amp;&amp;" equality-expression
+
+equality-expression
+  : relational-expression
+  | equality-expression "==" relational-expression
+  | equality-expression "!=" relational-expression
+
+relational-expression
+  : additive-expression
+  | relational-expression "&lt;" additive-expression
+  | relational-expression "&gt;" additive-expression
+  | relational-expression "&lt;=" additive-expression
+  | relational-expression "&gt;=" additive-expression
+
+additive-expression
+  : multiplicitive-expression
+  | additive-expression "+" multiplicitive-expression
+  | additive-expression "-" multiplicitive-expression
+
+multiplicitive-expression
+  : unary-expression
+  | multiplicitive-expression "*" unary-expression
+  | multiplicitive-expression "/" unary-expression
+  | multiplicitive-expression "%" unary-expression
+
+unary-expression
+  : primary-or-function-expression
+  | "+" unary-expression
+  | "-" unary-expression
+  | "!" unary-expression
+
+primary-or-function-expression
+  : primary-expression
+  | function-expression
+
+primary-expression
+  : identifier
+  | literal
+  | "(" expression ")"
+
+function-expression
+  : identifier <loc href="#content-value-arguments">&lt;arguments&gt;</loc>
+
+identifier
+  : <loc href="http://www.w3.org/TR/xmlschema-2/#token">xsd:token</loc>
+
+literal
+  : boolean-literal
+  | numeric-literal
+  | string-literal
+
+boolean-literal
+  : "true"
+  | "false"
+
+numeric-literal
+  : decimal-literal
+
+decimal-literal
+  : decimal-integer-literal "." decimal-digits? exponent-part?
+  | "." decimal-digits exponent-part?
+  | decimal-integer-literal exponent-part?
+
+decimal-integer-literal
+  : "0"
+  | non-zero-digit decimal-digits?
+
+decimal-digits
+  : decimal-digit
+  | decimal-digits decimal-digit
+
+decimal-digit
+  : "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8"
+
+non-zero-digit
+  : "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8"
+
+exponent-part
+  : exponent-indicator signed-integer
+
+exponent-indicator
+  : "e" | "E"
+
+signed-integer
+  : decimal-digits
+  | "+" decimal-digits
+  | "-" decimal-digits
+
+string-literal
+  : <loc href="#content-value-quoted-string">&lt;quoted-string&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+</div3>
+
+<div3 id="content-value-media-function">
+<head>&lt;media-function&gt;</head>
+<p>A &lt;media-function&gt; value is a sub-expression that may be used in a <loc href="#content-value-condition">&lt;condition&gt;</loc> value expression
+in order to perform a media query on the <loc href="#terms-related-media-object">related media object</loc> or the
+<loc href="#terms-document-processing-context">document processing context</loc>.</p>
+<table id="media-function-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;media-function&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;media-function&gt;
+  : "media" "(" media-query ")"
+
+media-query
+  : <loc href="#content-value-quoted-string">&lt;quoted-string&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<p>The <code>media-query</code> argument of a &lt;media-function&gt; value expression must adhere to
+the syntax of the <code>media_query_list</code> defined by <bibref ref="media-queries"/>, &sect; 3.</p>
+<p>A &lt;media-function&gt; value expression evaluates to <code>true</code> if the specified media query
+evaluates to <code>true</code>, otherwise, the value expression evaluates to <code>false</code>.</p>
+</div3>
+
+<div3 id="content-value-quoted-string">
+<head>&lt;quoted-string&gt;</head>
+<p>A &lt;quoted-string&gt; value expression is used to specify a double or single quoted string.</p>
+<table id="quoted-string-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;quoted-string&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;quoted-string&gt;
+  : double-quoted-string
+  | single-quoted-string
+
+double-quoted-string
+  : '"' ( [^"\\] | escape )+ '"'
+
+single-quoted-string
+  : "'" ( [^'\\] | escape )+ "'"
+
+escape
+  : '\\' <emph>char</emph>
+</eg>
+<!-- " -->
+</td>
+</tr>
+</tbody>
+</table>
+</div3>
+
+<div3 id="content-value-parameter-function">
+<head>&lt;parameter-function&gt;</head>
+<p>A &lt;parameter-function&gt; value is a sub-expression that may be used in a <loc href="#content-value-condition">&lt;condition&gt;</loc> value expression
+in order to obtain a named parameter of the <loc href="#terms-document-processing-context">document processing context</loc>.</p>
+<table id="parameter-function-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;parameter-function&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;parameter-function&gt;
+  : "parameter" "(" parameter-name ")"
+
+parameter-name
+  : <loc href="#content-value-quoted-string">&lt;quoted-string&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<p>When de-quoted, the <code>parameter-name</code> argument of a &lt;parameter-function&gt; value expression must adhere to an
+<loc href="http://www.w3.org/TR/xmlschema-2/#token">xsd:token</loc>, which must, in turn, be one of the values enumerated
+by <loc href="#content-value-bound-parameter">&lt;bound-parameter&gt;</loc>.</p>
+<p>A &lt;parameter-function&gt; value expression evaluates to the value associated with (bound to) the
+specified paramater name.</p>
+</div3>
+
+<div3 id="content-value-supports-function">
+<head>&lt;supports-function&gt;</head>
+<p>A &lt;supports-function&gt; value is a sub-expression that may be used in a <loc href="#content-value-condition">&lt;condition&gt;</loc> value expression
+in order to obtain a boolean value that denotes whether a specified <loc href="#terms-feature">feature</loc> or <loc href="#terms-extension">extension</loc>
+is supported or not.</p>
+<table id="supports-function-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;supports-function&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;supports-function&gt;
+  : "supports" "(" feature-or-extension-designator ")"
+
+feature-or-extension-designator
+  : <loc href="#content-value-quoted-string">&lt;quoted-string&gt;</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<p>The <code>feature-or-extension-designator</code> argument of a &lt;supports-function&gt; value expression must express
+a feature designation or an extension designation as defined by
+<specref ref="feature-designations"/> and <specref ref="extension-designations"/>, respectively, and where the
+<code>feature-namespace</code> or <code>extension-namespace</code> component of the designation is optional, and, if
+not specified, is considered to be equal to the <emph>TT Feature Namespace</emph> or <emph>TT Extension Namespace</emph>,
+respectively.</p>
+<p>A &lt;supports-function&gt; value expression evaluates to <code>true</code> if the specified feature or extension
+designator is (semantically) supported by the <loc href="#terms-content-processor">content processor</loc>.</p>
+</div3>
+
+</div2> <!-- content-value-expressions -->
 </div1> <!-- content -->
 
 <div1 id="embedded-content">
@@ -5383,6 +5767,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;audio
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-format">format</loc> = <loc href="#embedded-content-value-audio-format">&lt;audio-format&gt;</loc>
   <loc href="#embedded-content-attribute-src">src</loc> = <loc href="#embedded-content-value-audio">&lt;audio&gt;</loc>
   <loc href="#embedded-content-attribute-type">type</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -5445,6 +5830,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;chunk
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-encoding">encoding</loc> = (base16|base32|base32hex|base64|base64url) : base64
   length = <loc href="http://www.w3.org/TR/xmlschema-2/#nonNegativeInteger">xsd:nonNegativeInteger</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
@@ -5543,6 +5929,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;data
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-encoding">encoding</loc> = (base16|base32|base32hex|base64|base64url) : <emph>see prose below</emph>
   <loc href="#embedded-content-attribute-format">format</loc> = <loc href="#embedded-content-value-data-format">&lt;data-format&gt;</loc>
   length = <loc href="http://www.w3.org/TR/xmlschema-2/#nonNegativeInteger">xsd:nonNegativeInteger</loc>
@@ -5674,6 +6061,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;font
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   family = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-format">format</loc> = <loc href="#embedded-content-value-font-format">&lt;font-format&gt;</loc>
   range = <loc href="#embedded-content-value-unicode-range">&lt;unicode-range&gt;</loc>
@@ -5792,6 +6180,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;image
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-format">format</loc> = <loc href="#embedded-content-value-image-format">&lt;image-format&gt;</loc>
   <loc href="#embedded-content-attribute-src">src</loc> = <loc href="#embedded-content-value-image">&lt;image&gt;</loc>
   <loc href="#embedded-content-attribute-type">type</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -5899,6 +6288,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;resources
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -5938,6 +6328,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;source
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#embedded-content-attribute-format">format</loc> = <loc href="#embedded-content-value-data-format">&lt;data-format&gt;</loc>
   <loc href="#embedded-content-attribute-src">src</loc> = <loc href="#embedded-content-value-data">&lt;data&gt;</loc>
   <loc href="#embedded-content-attribute-type">type</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -6080,24 +6471,8 @@
 <item><p><loc href="#embedded-content-vocabulary-image"><el>image</el></loc></p></item>
 <item><p><loc href="#embedded-content-vocabulary-source"><el>source</el></loc></p></item>
 </ulist>
-<p>If specified, the value of a <att>format</att> attribute must adhere to the following generic
-syntax:</p>
-<table id="embedded-content-attribute-syntax-format" role="syntax">
-<caption>Syntax Representation &ndash; format</caption>
-<tbody>
-<tr>
-<td>
-<eg xml:space="preserve">
-&lt;format&gt;
-  : <loc href="http://www.w3.org/TR/xmlschema-2/#token">xsd:token</loc>
-  | <loc href="http://www.w3.org/TR/xmlschema-2/#anyURI">xsd:anyURI</loc>
-</eg>
-</td>
-</tr>
-</tbody>
-</table>
-<p>If a format expression takes the form of an <loc href="http://www.w3.org/TR/xmlschema-2/#anyURI">xsd:anyURI</loc>,
-then it must express an absolute URI.</p>
+<p>The value of a <att>format</att> attribute must adhere to a
+<loc href="#embedded-content-value-format">&lt;format&gt;</loc> expression.</p>
 <p>Depending on the context of use, additional constraints may apply.</p>
 </div3>
 <div3 id="embedded-content-attribute-src">
@@ -6148,6 +6523,7 @@
 <item><p><specref ref="embedded-content-value-data-format"/></p></item>
 <item><p><specref ref="embedded-content-value-font"/></p></item>
 <item><p><specref ref="embedded-content-value-font-format"/></p></item>
+<item><p><specref ref="embedded-content-value-format"/></p></item>
 <item><p><specref ref="embedded-content-value-image"/></p></item>
 <item><p><specref ref="embedded-content-value-image-format"/></p></item>
 <item><p><specref ref="embedded-content-value-unicode-range"/></p></item>
@@ -6295,6 +6671,32 @@
 prefix <code>"x-"</code> to form a private use token.</p>
 </note>
 </div3>
+<div3 id="embedded-content-value-format">
+<head>&lt;format&gt;</head>
+<p>A &lt;format&gt; expression is used to specify the format of a data resource. Additional format information is useful in the case
+of data resources that lack a registered media (content) type.</p>
+<table id="format-value-expression-syntax" role="syntax">
+<caption>Syntax Representation &ndash; &lt;format&gt;</caption>
+<tbody>
+<tr>
+<td>
+<eg xml:space="preserve">
+&lt;format&gt;
+  : <loc href="http://www.w3.org/TR/xmlschema-2/#token">xsd:token</loc>
+  | <loc href="http://www.w3.org/TR/xmlschema-2/#anyURI">xsd:anyURI</loc>
+</eg>
+</td>
+</tr>
+</tbody>
+</table>
+<p>If a format expression takes the form of an <loc href="http://www.w3.org/TR/xmlschema-2/#anyURI">xsd:anyURI</loc>,
+then it must express an absolute URI.</p>
+<note role="elaboration">
+<p>This specification does not standardize the set of format tokens. Authors are encouraged to
+use tokens in common use, or absent that, to add a prefix <code>"x-"</code> to form a private use token.
+Alternatively, an author may use an arbitrary absolute URI as a format specification.</p>
+</note>
+</div3>
 <div3 id="embedded-content-value-image">
 <head>&lt;image&gt;</head>
 <p>An &lt;image&gt; expression is used to specify an image resource by reference.</p>
@@ -6416,6 +6818,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;initial
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -6463,6 +6866,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;style
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#style-attribute-style">style</loc> = IDREFS
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -6503,6 +6907,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;styling
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -10553,7 +10958,7 @@
 <eg xml:space="preserve">
 &lt;familyName&gt;
   : unquoted-string
-  | quoted-string
+  | <loc href="#content-value-quoted-string">&lt;quoted-string&gt;</loc>
 
 unquoted-string
   : identifier ( lwsp identifier )*
@@ -10579,16 +10984,6 @@
 
 escape
   : '\\' <emph>char</emph>
-
-quoted-string
-  : double-quoted-string
-  | single-quoted-string
-
-double-quoted-string
-  : '"' ( [^"\\] | escape )+ '"'
-
-single-quoted-string
-  : "'" ( [^'\\] | escape )+ "'"
 </eg>
 <!-- " -->
 </td>
@@ -11574,6 +11969,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;layout
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -11626,6 +12022,7 @@
 &lt;region
   <loc href="#animation-attribute-animate">animate</loc> = IDREFS
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#style-attribute-style">style</loc> = IDREFS
@@ -12767,6 +13164,7 @@
 &lt;animate
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   calcMode = <loc href="#animation-value-calcMode">&lt;calcMode&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   fill = <loc href="#animation-value-fill">&lt;fill&gt;</loc>
@@ -12900,6 +13298,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;animation
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -12937,6 +13336,7 @@
 <eg xml:space="preserve">
 &lt;set
   <loc href="#timing-attribute-begin">begin</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#timing-attribute-dur">dur</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   <loc href="#timing-attribute-end">end</loc> = <loc href="#timing-value-timeExpression">&lt;timeExpression&gt;</loc>
   fill = <loc href="#animation-value-fill">&lt;fill&gt;</loc>
@@ -13337,6 +13737,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;metadata
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -13466,6 +13867,7 @@
 <eg xml:space="preserve">
 &lt;ttm:actor
   <phrase role="reqattr">agent</phrase> = IDREF
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -13498,6 +13900,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:agent
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <phrase role="reqattr">type</phrase> = (<emph>person</emph>|<emph>character</emph>|<emph>group</emph>|<emph>organization</emph>|<emph>other</emph>)
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -13594,6 +13997,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:copyright
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -13620,6 +14024,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:desc
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -13648,6 +14053,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:item
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <phrase role="reqattr">name</phrase> = (<loc href="http://www.w3.org/TR/xmlschema-2/#token">xsd:token</loc>|<loc href="http://www.w3.org/TR/xmlschema-2/#anyURI">xsd:anyURI</loc>)
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -13718,6 +14124,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:name
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <phrase role="reqattr">type</phrase> = (<emph>full</emph>|<emph>family</emph>|<emph>given</emph>|<emph>alias</emph>|<emph>other</emph>)
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
@@ -13755,6 +14162,7 @@
 <td>
 <eg xml:space="preserve">
 &lt;ttm:title
+  <loc href="#content-attribute-condition">condition</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-id">xml:id</loc> = ID
   <loc href="#content-attribute-lang">xml:lang</loc> = <loc href="http://www.w3.org/TR/xmlschema-2/#string">xsd:string</loc>
   <loc href="#content-attribute-space">xml:space</loc> = (<emph>default</emph>|<emph>preserve</emph>)
@@ -16884,6 +17292,10 @@
 W3C Recommendation, 28 October 2014. (See
 <xspecref href="http://www.w3.org/TR/2014/REC-html5-20141028/">http://www.w3.org/TR/2014/REC-html5-20141028/</xspecref>.)
 </bibl>
+<bibl id="media-queries" key="Media Queries">Florian Rivoal,,
+<titleref href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/">Media Queries</titleref>, W3C Recommendation, 19 June 2012. (See
+<xspecref href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/">http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/</xspecref>.)
+</bibl>
 <bibl id="mime" key="MIME">Ned Freed and Nathaniel Borenstein,  
 <titleref
 href="http://www.rfc-editor.org/rfc/rfc2045.txt">Multipurpose Internet
Binary file ttml2/spec/xsd/schema.zip has changed
--- a/ttml2/spec/xsd/ttml2-core-attribs.xsd	Tue Nov 25 14:05:47 2014 -0700
+++ b/ttml2/spec/xsd/ttml2-core-attribs.xsd	Tue Nov 25 18:56:47 2014 -0700
@@ -5,16 +5,21 @@
   xmlns:xml="http://www.w3.org/XML/1998/namespace">
   <xs:import namespace="http://www.w3.org/XML/1998/namespace"
     schemaLocation="xml.xsd"/>
+  <xs:attributeGroup name="Core.Condition.attrib.class">
+    <xs:attribute name="condition" type="xs:string"/>
+  </xs:attributeGroup>
   <xs:attributeGroup name="Core.ID.attrib.class">
     <xs:attribute ref="xml:id"/>
   </xs:attributeGroup>
   <xs:attributeGroup name="Core.attrib.class">
+    <xs:attributeGroup ref="tt:Core.Condition.attrib.class"/>
     <xs:attributeGroup ref="tt:Core.ID.attrib.class"/>
     <xs:attribute ref="xml:lang"/>
     <xs:attribute ref="xml:space"/>
     <xs:anyAttribute namespace="##other" processContents="lax"/>
   </xs:attributeGroup>
   <xs:attributeGroup name="Core.required.attrib.class">
+    <xs:attributeGroup ref="tt:Core.Condition.attrib.class"/>
     <xs:attributeGroup ref="tt:Core.ID.attrib.class"/>
     <xs:attribute ref="xml:lang" use="required"/>
     <xs:attribute ref="xml:space"/>
ttml

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