improved 'pause' collapsing and adjoining definitions. Added example for user-agent stlyesheet override of prosodic break strength.

Author: danielweck

css3-speech/Overview.html

@@ -714,7 +714,7 @@ <h2 id=speaking-props><span class=secno>5. </span>Speaking properties:
      the aural rendering. However, the pauses, cues, and rests of the
      ancestor element remain "deactivated" in the aural dimension, and
      therefore do not contribute to the <a href="#collapsing">collapsing of
-     pauses</a> or additive behavior of adjacent rests.</p>
+     pauses</a> or additive behavior of adjoining rests.</p>
     <!--
 Descendant elements do not get rendered either;
 this behavior cannot be overridden by setting the 'speakability' property on the descendants.
@@ -948,21 +948,20 @@ <h2 id=pause-props><span class=secno>6. </span>Pause properties: &lsquo;<a
     rel=biblioentry>[CSS3VAL]<!--{{!CSS3VAL}}--></a>. Only positive values
     are allowed.
 
-   <dt><strong>none</strong>, <strong>x-weak</strong>, <strong>weak</strong>,
+   <dt> <strong>none</strong>
+
+   <dd> Equivalent to 0ms (no prosodic break in the speech output). This
+    value can be used to inhibit a prosodic break which the processor would
+    otherwise produce.
+
+   <dt> <strong>x-weak</strong>, <strong>weak</strong>,
     <strong>medium</strong>, <strong>strong</strong>, and
     <strong>x-strong</strong>
 
-   <dd>These values can be used to indicate the prosodic strength of the
-    break in speech output. The synthesis processor may insert a pause as
-    part of its implementation of the prosodic break. The value "none"
-    indicates that no prosodic break boundary should be output, and can be
-    used to inhibit a prosodic break which the processor would otherwise
-    produce. The other values indicate monotonically non-decreasing
-    (conceptually increasing) break strength between elements. "x-weak" and
-    "x-strong" are mnemonics for "extra weak" and "extra strong",
-    respectively. The stronger boundaries are typically accompanied by
-    pauses. The breaks between paragraphs are typically much stronger than
-    the breaks between words within a sentence.
+   <dd> Expresses the pause by the strength of the prosodic break in speech
+    output. The exact time is implementation-dependent. The values indicate
+    monotonically non-decreasing (conceptually increasing) break strength
+    between elements.
   </dl>
 
   <table class=propdef summary="name: syntax">
@@ -975,10 +974,10 @@ <h2 id=pause-props><span class=secno>6. </span>Pause properties: &lsquo;<a
     <tr>
      <td><em>Value:</em>
 
-     <td>[ &lt;&lsquo;<a href="#pause-before"><code
+     <td>&lt;&lsquo;<a href="#pause-before"><code
       class=property>pause-before</code></a>&rsquo;&gt; || &lt;&lsquo;<a
       href="#pause-after"><code
-      class=property>pause-after</code></a>&rsquo;&gt; ] | inherit
+      class=property>pause-after</code></a>&rsquo;&gt;
 
     <tr>
      <td><em>Initial:</em>
@@ -1031,17 +1030,33 @@ <h2 id=pause-props><span class=secno>6. </span>Pause properties: &lsquo;<a
 </pre>
   </div>
 
+  <p> The default strengths of prosodic breaks for specific elements are
+   defined by the user-agent stylesheet, and can be overridden by authored
+   styles, as demonstrated by the example below.
+
+  <div class=example>
+   <p>Example:</p>
+
+   <pre>
+p { pause: none } /* pause-before: none; pause-after: none */
+</pre>
+  </div>
+
+  <p class=note> Note that stronger content boundaries are typically
+   accompanied by pauses. For example, the breaks between paragraphs are
+   typically much more substantial than the breaks between words within a
+   sentence.
+
   <h3 id=collapsing><span class=secno>6.1. </span>Collapsing pauses</h3>
 
   <p>The pause defines the minimum distance of the aural "box" to the aural
-   "boxes" before and after it. Adjacent pauses should be merged by selecting
-   the strongest named break or the longest absolute time interval. Thus
-   "strong" is selected when comparing "strong" and "weak", while "1s" is
-   selected when comparing "1s" and "250ms". We say that such pauses <dfn
-   id=collapse>collapse</dfn>. A combination of a named break and time
-   duration is treated additively.
+   "boxes" before and after it. Adjoining pauses are merged by selecting the
+   strongest named break and the longest absolute time interval. Thus
+   "strong" is selected when comparing "strong" and "weak", "1s" is selected
+   when comparing "1s" and "250ms", and "strong" and "250ms" take effect
+   additively when comparing "strong" and "250ms".
 
-  <p>The following pauses collapse:
+  <p>The following pauses are adjoining:
 
   <ol>
    <li>The &lsquo;<a href="#pause-after"><code
@@ -1070,41 +1085,19 @@ <h3 id=collapsing><span class=secno>6.1. </span>Collapsing pauses</h3>
     href="#pause-after"><code class=property>pause-after</code></a>&rsquo; of
     an aural "box", if the the "box" has a &lsquo;<a
     href="#voice-duration"><code
-    class=property>voice-duration</code></a>&rsquo; of "0ms", no &lsquo;<a
+    class=property>voice-duration</code></a>&rsquo; of "0ms" and no &lsquo;<a
     href="#rest-before"><code class=property>rest-before</code></a>&rsquo; or
     &lsquo;<a href="#rest-after"><code
-    class=property>rest-after</code></a>&rsquo;, no &lsquo;<a
+    class=property>rest-after</code></a>&rsquo; and no &lsquo;<a
     href="#cue-before"><code class=property>cue-before</code></a>&rsquo; or
     &lsquo;<a href="#cue-after"><code
-    class=property>cue-after</code></a>&rsquo; and no content.
+    class=property>cue-after</code></a>&rsquo;, or if the the "box" has no
+    rendered content at all (see &lsquo;<a href="#speak"><code
+    class=property>speak</code></a>&rsquo;).
   </ol>
 
-  <p>The &lsquo;<a href="#pause-after"><code
-   class=property>pause-after</code></a>&rsquo; of an element is always
-   adjoining to the &lsquo;<a href="#pause-before"><code
-   class=property>pause-before</code></a>&rsquo; of its next sibling.
-
-  <p>The &lsquo;<a href="#pause-before"><code
-   class=property>pause-before</code></a>&rsquo; an element is adjoining to
-   its first child's &lsquo;<a href="#pause-before"><code
-   class=property>pause-before</code></a>&rsquo;, if the element has no
-   &lsquo;<a href="#cue-before"><code
-   class=property>cue-before</code></a>&rsquo; nor &lsquo;<a
-   href="#rest-before"><code class=property>rest-before</code></a>&rsquo;.
-
-  <p>The &lsquo;<a href="#pause-after"><code
-   class=property>pause-after</code></a>&rsquo; of an element is adjoining to
-   its last child's &lsquo;<a href="#pause-after"><code
-   class=property>pause-after</code></a>&rsquo;, if the element has no
-   &lsquo;<a href="#rest-after"><code
-   class=property>rest-after</code></a>&rsquo; or &lsquo;<a
-   href="#cue-after"><code class=property>cue-after</code></a>&rsquo;.
-
-  <p>An element's own pauses are adjoining if the &lsquo;<a
-   href="#voice-duration"><code
-   class=property>voice-duration</code></a>&rsquo; property is zero, and it
-   has no rest, and it does not contain any content, and all of its
-   children's pauses (if any) are adjoining.
+  <p>A collapsed pause is considered adjoining to another pause if any of its
+   component pauses is adjoining to that pause.
 
   <p class=note> Note that &lsquo;<a href="#pause"><code
    class=property>pause</code></a>&rsquo; has been moved from between the
@@ -1224,27 +1217,28 @@ <h2 id=rest-props><span class=secno>7. </span>Rest properties: &lsquo;<a
     rel=biblioentry>[CSS3VAL]<!--{{!CSS3VAL}}--></a>. Only positive values
     are allowed.
 
-   <dt><strong>none</strong>, <strong>x-weak</strong>, <strong>weak</strong>,
+   <dt> <strong>none</strong>
+
+   <dd> Equivalent to 0ms (no prosodic break in the speech output). This
+    value can be used to inhibit a prosodic break which the processor would
+    otherwise produce.
+
+   <dt> <strong>x-weak</strong>, <strong>weak</strong>,
     <strong>medium</strong>, <strong>strong</strong>, and
     <strong>x-strong</strong>
 
-   <dd>These values can be used to indicate the prosodic strength of the
-    break in speech output. The synthesis processor may insert a rest as part
-    of its implementation of the prosodic break. The value "none" indicates
-    that no prosodic break boundary should be output, and can be used to
-    inhibit a prosodic break which the processor would otherwise produce. The
-    other values indicate monotonically non-decreasing (conceptually
-    increasing) break strength between words. The stronger boundaries are
-    typically accompanied by rests. "x-weak" and "x-strong" are mnemonics for
-    "extra weak" and "extra strong", respectively.
+   <dd> Expresses the rest by the strength of the prosodic break in speech
+    output. The exact time is implementation-dependent. The values indicate
+    monotonically non-decreasing (conceptually increasing) break strength
+    between elements.
   </dl>
 
   <p>As opposed to <a href="#pause-props">pause properties</a>, the rest is
    inserted between the element's content and any &lsquo;<a
    href="#cue-before"><code class=property>cue-before</code></a>&rsquo; or
    &lsquo;<a href="#cue-after"><code
-   class=property>cue-after</code></a>&rsquo; content. Adjacent rests are
-   treated additively.
+   class=property>cue-after</code></a>&rsquo; content. Adjoining rests are
+   treated additively, and do not collapse.
 
   <table class=propdef summary="name: syntax">
    <tbody>
@@ -1256,10 +1250,10 @@ <h2 id=rest-props><span class=secno>7. </span>Rest properties: &lsquo;<a
     <tr>
      <td><em>Value:</em>
 
-     <td>[ &lt;&lsquo;<a href="#rest-before"><code
+     <td>&lt;&lsquo;<a href="#rest-before"><code
       class=property>rest-before</code></a>&rsquo;&gt; || &lt;&lsquo;<a
       href="#rest-after"><code
-      class=property>rest-after</code></a>&rsquo;&gt; ] | inherit
+      class=property>rest-after</code></a>&rsquo;&gt;
 
     <tr>
      <td><em>Initial:</em>
@@ -1411,9 +1405,9 @@ <h2 id=cue-props><span class=secno>8. </span>Cue properties: &lsquo;<a
    <dt><strong>&lt;uri&gt;</strong>
 
    <dd>The URI must designate an auditory icon resource. If the URI resolves
-    to something other than an audio file, such as an image, the resource
-    should be ignored and the property treated as if it had the value
-    &lsquo;<code class=property>none</code>&rsquo;.
+    to something other than an audio file, such as an image, the resource is
+    ignored and the property treated as if it had the value &lsquo;<code
+    class=property>none</code>&rsquo;.
 
    <dt><strong>none</strong>
 
@@ -1480,10 +1474,9 @@ <h2 id=cue-props><span class=secno>8. </span>Cue properties: &lsquo;<a
     <tr>
      <td><em>Value:</em>
 
-     <td>[ &lt;&lsquo;<a href="#cue-before"><code
+     <td>&lt;&lsquo;<a href="#cue-before"><code
       class=property>cue-before</code></a>&rsquo;&gt; || &lt;&lsquo;<a
       href="#cue-after"><code class=property>cue-after</code></a>&rsquo;&gt;
-      ] | inherit
 
     <tr>
      <td><em>Initial:</em>
@@ -1674,7 +1667,7 @@ <h2 id=cue-props><span class=secno>8. </span>Cue properties: &lsquo;<a
 </tr>
 <tr>
 <td><em>Value:</em></td>
-<td>[ &lt;'mark-before'&gt; || &lt;'mark-after'&gt; ]</td>
+<td>&lt;'mark-before'&gt; || &lt;'mark-after'&gt;</td>
 </tr>
 <tr>
 <td><em>Initial:</em></td>
@@ -2613,8 +2606,7 @@ <h2 class=no-num id=property-index>Appendix B &mdash; Property index</h2>
     <tr valign=baseline>
      <td><a class=property href="#cue">cue</a>
 
-     <td>[ &lt;&lsquo;cue-before&rsquo;&gt; ||
-      &lt;&lsquo;cue-after&rsquo;&gt; ] | inherit
+     <td>&lt;&lsquo;cue-before&rsquo;&gt; || &lt;&lsquo;cue-after&rsquo;&gt;
 
      <td>N/A (see individual properties)
 
@@ -2659,8 +2651,8 @@ <h2 class=no-num id=property-index>Appendix B &mdash; Property index</h2>
     <tr valign=baseline>
      <td><a class=property href="#pause">pause</a>
 
-     <td>[ &lt;&lsquo;pause-before&rsquo;&gt; ||
-      &lt;&lsquo;pause-after&rsquo;&gt; ] | inherit
+     <td>&lt;&lsquo;pause-before&rsquo;&gt; ||
+      &lt;&lsquo;pause-after&rsquo;&gt;
 
      <td>N/A (see individual properties)
 
@@ -2722,8 +2714,8 @@ <h2 class=no-num id=property-index>Appendix B &mdash; Property index</h2>
     <tr valign=baseline>
      <td><a class=property href="#rest">rest</a>
 
-     <td>[ &lt;&lsquo;rest-before&rsquo;&gt; ||
-      &lt;&lsquo;rest-after&rsquo;&gt; ] | inherit
+     <td>&lt;&lsquo;rest-before&rsquo;&gt; ||
+      &lt;&lsquo;rest-after&rsquo;&gt;
 
      <td>N/A (see individual properties)
 
@@ -2992,9 +2984,6 @@ <h2 class=no-num id=index>Appendix C &mdash; Index</h2>
 
    <li>border, <a href="#border-def" title=border><strong>#</strong></a>
 
-   <li>collapse, <a href="#collapse" title=collapse><strong>6.1.</strong></a>
-    
-
    <li>content, <a href="#content-def" title=content><strong>#</strong></a>
 
    <li>cue, <a href="#cue" title=cue><strong>8.</strong></a>
@@ -3320,7 +3309,7 @@ <h2 class=no-num id=changes>Appendix F &mdash; Changes from previous draft</h2>
   <ul>
    <li>Adjusted the [initial] value for shorthand properties, to be
     consistent with other CSS specifications (i.e. "see individual
-    properties")
+    properties"), and removed the erroneous "inherit" value.
 
    <li>Fixed the [initial] values for &lsquo;<a href="#pause"><code
     class=property>pause</code></a>&rsquo; and &lsquo;<a href="#rest"><code
@@ -3347,6 +3336,8 @@ <h2 class=no-num id=changes>Appendix F &mdash; Changes from previous draft</h2>
    <li>Cleaned-up the list of module dependencies, and removed redundant
     "module dependencies" section.
 
+   <li>Improved the pause collapsing prose, removed redundant paragraphs.
+
    <li>Fixed typos and made other minor edits.
   </ul>
   <!-- For reference only, changes in previous draft: -->