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[css2] Move speak-headers property to appendix A.
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‎css2/tables.src‎

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html lang="en">
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<!-- $Id: tables.src,v 2.48 2002-04-22 22:05:22 bbos Exp $ -->
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<!-- $Id: tables.src,v 2.49 2002-04-29 19:15:56 bbos Exp $ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
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<title>Tables</title>
@@ -1429,150 +1429,6 @@ it were coming out of the canvas. In the
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border model</a>, same as 'ridge'.
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</dl>
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<h2>Audio rendering of tables</h2>
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<p>When a table is spoken by a speech generator, the relation between
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the data cells and the header cells must be expressed in a different
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way than by horizontal and vertical alignment. Some speech browsers
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may allow a user to move around in the 2-dimensional space, thus
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giving them the opportunity to map out the spatially represented
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relations. When that is not possible, the style sheet must specify at
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which points the headers are spoken.</p>
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<h3><a name="speak-headers">Speaking headers:</a> the <span
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class="propinst-speak-header">'speak-header'</span> property</h3>
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<!-- #include src=properties/speak-header.srb -->
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<P>This property specifies whether table headers
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are spoken before every
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cell, or only before a cell when that cell is associated with a
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different header than the previous cell. Values have
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the following meanings:</p>
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<dl>
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<dt><strong>once</strong>
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<dd>The header is spoken one time, before a series of
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cells.
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<dt><strong>always</strong>
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<dd>The header is spoken before every pertinent cell.
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</dl>
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<p>Each document language may have different mechanisms that allow
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authors to specify headers. For example, in HTML 4.0 ([[HTML40]]), it
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is possible to specify header information with three different
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attributes ("headers", "scope", and "axis"), and the specification
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gives an algorithm for determining header information when these
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attributes have not been specified.</p>
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<div class="html-example">
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<div class="figure">
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<P><img src="images/table1.gif" alt="Image of a table created in MS
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Word"><p class="caption"> Image of a table with header cells ("San
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Jose" and "Seattle") that are not in the same column or row as the
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data they apply to.
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</div>
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<p>This HTML example presents the money spent on meals, hotels and
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transport in two locations (San Jose and Seattle) for successive
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days. Conceptually, you can think of the table in terms of an
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n-dimensional space. The headers of this space are: location, day,
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category and subtotal. Some cells define marks along an axis while
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others give money spent at points within this space. The markup
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for this table is:</p>
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<pre>
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&lt;TABLE&gt;
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&lt;CAPTION&gt;Travel Expense Report&lt;/CAPTION&gt;
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&lt;TR&gt;
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&lt;TH&gt;&lt;/TH&gt;
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&lt;TH&gt;Meals&lt;/TH&gt;
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&lt;TH&gt;Hotels&lt;/TH&gt;
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&lt;TH&gt;Transport&lt;/TH&gt;
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&lt;TH&gt;subtotal&lt;/TH&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH id="san-jose" axis="san-jose"&gt;San Jose&lt;/TH&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="san-jose"&gt;25-Aug-97&lt;/TH&gt;
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&lt;TD&gt;37.74&lt;/TD&gt;
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&lt;TD&gt;112.00&lt;/TD&gt;
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&lt;TD&gt;45.00&lt;/TD&gt;
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&lt;TD&gt;&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="san-jose"&gt;26-Aug-97&lt;/TH&gt;
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&lt;TD&gt;27.28&lt;/TD&gt;
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&lt;TD&gt;112.00&lt;/TD&gt;
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&lt;TD&gt;45.00&lt;/TD&gt;
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&lt;TD&gt;&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="san-jose"&gt;subtotal&lt;/TH&gt;
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&lt;TD&gt;65.02&lt;/TD&gt;
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&lt;TD&gt;224.00&lt;/TD&gt;
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&lt;TD&gt;90.00&lt;/TD&gt;
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&lt;TD&gt;379.02&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH id="seattle" axis="seattle"&gt;Seattle&lt;/TH&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="seattle"&gt;27-Aug-97&lt;/TH&gt;
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&lt;TD&gt;96.25&lt;/TD&gt;
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&lt;TD&gt;109.00&lt;/TD&gt;
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&lt;TD&gt;36.00&lt;/TD&gt;
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&lt;TD&gt;&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="seattle"&gt;28-Aug-97&lt;/TH&gt;
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&lt;TD&gt;35.00&lt;/TD&gt;
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&lt;TD&gt;109.00&lt;/TD&gt;
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&lt;TD&gt;36.00&lt;/TD&gt;
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&lt;TD&gt;&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH headers="seattle"&gt;subtotal&lt;/TH&gt;
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&lt;TD&gt;131.25&lt;/TD&gt;
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&lt;TD&gt;218.00&lt;/TD&gt;
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&lt;TD&gt;72.00&lt;/TD&gt;
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&lt;TD&gt;421.25&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;TR&gt;
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&lt;TH&gt;Totals&lt;/TH&gt;
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&lt;TD&gt;196.27&lt;/TD&gt;
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&lt;TD&gt;442.00&lt;/TD&gt;
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&lt;TD&gt;162.00&lt;/TD&gt;
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&lt;TD&gt;800.27&lt;/TD&gt;
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&lt;/TR&gt;
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&lt;/TABLE&gt;
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</pre>
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<p>By providing the data model in this way, authors make it
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possible for speech enabled-browsers to explore the table in
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rich ways, e.g., each cell could be spoken as a list, repeating the
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applicable headers before each data cell:</p>
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<pre>
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San Jose, 25-Aug-97, Meals: 37.74
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San Jose, 25-Aug-97, Hotels: 112.00
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San Jose, 25-Aug-97, Transport: 45.00
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...
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</pre>
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<p>The browser could also speak the headers only when they change:</p>
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<pre>
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San Jose, 25-Aug-97, Meals: 37.74
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Hotels: 112.00
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Transport: 45.00
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26-Aug-97, Meals: 27.28
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Hotels: 112.00
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...
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</pre>
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</div>
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</body>
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</html>
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