empty list of restricted  XPath 1.0 expressions.<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="getRefKey()"><!-- --></A><H3>
getRefKey</H3>
<PRE>
public <A HREF="../../../../org/apache/xerces/xs/XSIDCDefinition.html">XSIDCDefinition</A> <B>getRefKey</B>()</PRE>
<DL>
<DD>[referenced key]: required if [identity-constraint category] is keyref, 
 <code>null</code> otherwise. An identity-constraint definition with [
 identity-constraint category] equal to key or unique.<DD><DL>
</DL>
</DD>
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<A NAME="getAnn