Specify whether to show the attribute fixed value.
<p>
The default value is provided by the <code>'fixed'</code> attribute
specified in the XSD element of the attribute declaration.
For example:
<dl><dd>
<code>&lt;xs:attribute name="version" type="xs:string" <b>fixed="2.0"</b>/&gt;</code>
</dd></dl>

When the attribute is defined by reference to a global attribute, its fixed value can be specified either 
in the local reference component (which is being documented here) or in the global (referenced)
attribute component.
In that case, the <code>fixed</code> attribute is searched for in the both components.