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<title>Adding attribute groups</title>
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<h1 class="topictitle1">Adding attribute groups</h1>
<div><p>An attribute group definition is an association between a name
and a set of attribute declarations. Named groups of attribute declarations
can greatly facilitate the maintenance and reuse of common attribute declarations
in an XML schema.</p>
<div class="section"><p>The following instructions were written for the Resource perspective,
but they will also work in many other perspectives.</p>
<p>To add an
attribute group to an XML schema, follow these steps:</p>
</div>
<ol><li class="skipspace"><span>Open your XML schema in the XML schema editor.</span></li>
<li class="skipspace"><span>In the Outline view, right-click the XML schema and click  
<b>  <span class="uicontrol">Add
Attribute Group</span></b>.</span> It appears in the <span class="uicontrol">Attribute
Groups</span> folder.</li>
<li class="skipspace"><span>Select your new group, and in the Properties view, type a name
for the attribute group in the  <b>  <span class="uicontrol">Name</span></b> field.</span></li>
<li class="skipspace"><span>To add an attribute, right-click your attribute group in the Outline
view, click <b> <span class="uicontrol">Add Attribute</span></b>.</span> The attribute
appears below the attribute group in the Outline view.<ol type="a"><li class="skipspace"><span>Select the attribute, and in the Properties view, type the 
	<b> <span class="uicontrol">Name</span></b> of it.</span></li>
<li><span>Click the <b> <span class="uicontrol">More</span></b> <img src="../images/More.gif" alt="This graphic is the More button" /> button and specify the
type for the attribute. The</span>&nbsp; Set Type dialog lists all built-in and 
user-defined types currently available. You can change the <b>
<span class="uicontrol">Scope</span></b> of the list by selecting one of the 
following options:  
<ul>
	<li><b><span class="uicontrol">Workspace</span></b>. Lists all of the types 
	available in your workspace. </li>
	<li><b><span class="uicontrol">Enclosing Project</span>.</b> Lists all of 
	the types available in the project that contains your file. </li>
	<li>(Default) <b><span class="uicontrol">Current Resource</span>.</b> List 
	all of the types available in your current file.</li>
</ul>
	</li>
</ol>
</li>
<li class="skipspace"><span>An attribute reference provides a reference to a global attribute.
To add an attribute reference, right-click your attribute group, and click <b> <span class="uicontrol">Add
Attribute Ref</span>.</b></span> A declaration that references a global
attribute enables the referenced attribute to appear in the instance document
in the context of the referencing declaration. The menu option to add
an attribute reference only appears if there are global attributes defined
elsewhere in the document.<ol type="a"><li><span>Select the reference (which appears below the attribute group
in the Outline view), then select the global attribute you want it to reference
from the <b> <span class="uicontrol">ref</span></b> drop down list.</span></li>
</ol>
</li>
<li class="skipspace"><span>An attribute group reference provides a reference to an attribute
group. To add an attribute group reference, right-click your attribute group,
and click <span class="uicontrol"><b>Add Attribute Group Ref</b></span>, and fill in the
field values as necessary.</span> A declaration that references an attribute
group enables the referenced attribute group to appear in the instance document
in the context of the referencing declaration. The menu option to add an attribute
group reference only appears if there are attribute groups defined elsewhere
in the document.<ol type="a"><li><span>Select the reference (which appears below the attribute group
in the Outline view), then select the attribute group you want it to reference
from the <b> <span class="uicontrol">ref</span></b> drop down list.</span></li>
</ol>
</li>
<li class="skipspace"><span>An <samp class="codeph">any</samp> element enables element content according
to namespaces, and the corresponding <samp class="codeph">any</samp> attribute 
element enables attributes to appear in elements. To add an <samp class="codeph">any</samp> attribute,
right-click your attribute group and click <b> <span class="uicontrol">Add Any Attribute</span></b>.</span> The <samp class="codeph">any</samp> attribute 
appears below the attribute group in the Outline
view. You can specify the following values for an <samp class="codeph">any</samp> attribute:<ul><li>For a <b>namespace</b> value, you can select <b>##any</b> (this allows
any well-formed XML from any namespace), <b>##local </b> (this allows any
well-formed XML that is not declared to be in a namespace, <b>##other </b> (this
allows any well-formed XML that is not from the target namespace of the type
being defined) or <b>##targetNamespace </b> (which is shorthand for the target
namespace of the type being defined). </li>
<li>For a <b> <span class="uicontrol">processContents</span></b> value, you can select <b>skip</b> (the
XML processor will not validate the attribute content at all), <b>lax</b> (the
XML processor will validate the attribute content as much as it can), or <b>strict </b> (the
XML processor will validate all the attribute content).</li>
</ul>
 </li>
</ol>
</div>
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