th 1.0 expressions.</TD>
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<CODE>&nbsp;<A HREF="../../../../org/apache/xerces/xs/XSIDCDefinition.html">XSIDCDefinition</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/xerces/xs/XSIDCDefinition.html#getRefKey()">getRefKey</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[referenced key]: required if [identity-constraint category] is keyref, 
 <code>nu