Action : 1398 Provide spec. text for aria-roledescription

I abbreviated the name to aria-roledesc as it is too long. Note: SVG has a
<desc> element. In the discussion we agreed to limit the roles that this
attribute would be applied to in ARIA 1.1 to "group" and "region".


The following is spec. text for aria-roledesc for the states and properties
spec file.

<div class="property" id="aria-roledesc">
   <h3 class="property-name"
id="aria-roledesc_header"><code>aria-roledesc</code> <span
class="type-indicator">(property)</span></h3>
    <p class="permalink"><a href="states_and_properties#aria-roledesc"
title="Permalink for aria-roledesc">#</a></p>
    <div class="property-description">
	<p>Provides a human readable, localized string name for the role of
the element. The role of the element <em>MUST</em> have a computed value of
<a class="role-reference" href="roles#goup"><code>group</code></a> or <a
class="role-reference" href="roles#region"><code>region</code</a> to apply
aria-roledesc.</p>

     <p class="note" role="note">Note: The computed role of the element is
localized by applicable assistive technologies. The aria-roledesc property
provides a mechanism for the author to provide that localized string in its
place.</p>
    </div>
    <table class="property-features">
       <caption>Characteristics of aria-roledesc</caption>
       <thead><tr><th scope="col">Characteristic</th><th
scope="col">Value</th></tr></thead>
       <tbody>
           <tr><th class="property-applicability-head" scope="row">Used in
Roles:</th>
             <td class="property-applicability">
                 <ul>
                    <li><a class="role-reference"
href="roles#goup"><code>group</code></a></li>
                    <li><a class="role-reference"
href="roles#region"><code>region</code></a></li>
                 <ul>
             </td>
           </tr>
           <tr><th class="property-value-head" scope="row">Value:</th>
               <td class="property-value"><a href="
states_and_properties#valuetype_string">string</a></td>
           </tr>
       </tbody>
    </table>
 </div>


The following spec. text goes into role group and role region under
supported states and properties:


<li><a class="property-reference-" href="
states_and_properties#aria-roledesc"><code>aria-roledesc</code></a>
(noninhertitable by subclass roles)</li>


We will need to make sure the model generator picks this change up.


Rich Schwerdtfeger