ion.html">Expression</A>&nbsp;pred)</PRE>
<DL>
<DD>Visit a predicate within a location path.  Note that there isn't a 
 proper unique component for predicates, and that the expression will 
 be called also for whatever type Expression is.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>owner</CODE> - The owner of the expression, to which the expression can 
              be reset if rewriting takes place.<DD><CODE>pred</CODE> - The predicate object.<DT><B>Returns:</B><DD>true if the sub expressions should be traver