/B>(int&nbsp;index)</PRE>
<DL>
<DD>Returns <tt>true</tt> if the specified attribute is determined
 to be ID.
 
 <p>
 Exacly how an attribute is "determined to be ID" is up to the
 schema language. In case of W3C XML Schema, this means
 that the actual type of the attribute is the built-in ID type
 or its derived type.
 
 <p>
 A <A HREF="../../../javax/xml/parsers/DocumentBuilder.html"><CODE>DocumentBuilder</CODE></A> uses this information
 to properly implement <A HREF="../../../org/w3c/dom/Attr.html#isId()