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<H1>Association of properties to definitions</H1>
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<H1><A NAME="SEC4" HREF="prop_toc.html#SEC4">Check for Unique Object Occurrences</A></H1>
<P>
This module associates a boolean property <CODE>NAMEUnique</CODE>
to object keys. It has the value 1 if the object occurs
only once in the SYMBOL context <CODE>NAMEUnique</CODE>.
It has the value 0 if it occurs more than once in the <CODE>NAMEUnique</CODE>
context; otherwise the property is not set.
The final value of the property is
obtained by the attribute <CODE>NAMEUnique.NAMEUnique</CODE>, e.g.
used to issue a message indicating multiple occurrences.
(The same task can be solved using the more general module,
See <A HREF="prop_2.html#SEC2">Count Occurrences of Objects</A>.)
<P>
The module is instantiated by
<PRE>
$/Prop/Unique.gnrc+instance=NAME +referto=KEY :inst
</PRE>
<A NAME="IDX28"></A>
<P>
The role <CODE>NAMERangeUnique</CODE> is automatically associated to
the grammar root (see <A HREF="prop_1.html#SEC1">Common Aspects of Property Modules</A>).
<P>
The multiply defined check for our running example, as explained for
the <CODE>OccCnt</CODE> module (see <A HREF="prop_2.html#SEC2">Count Occurrences of Objects</A>), can be also achieved by:
<P>
<PRE>
SYMBOL MultDefChk INHERITS Unique COMPUTE
IF (NOT (THIS.Unique),
message (ERROR, CatStrInd ("identifier is multiply defined: ", THIS.Sym),
0, COORDREF));
END;
</PRE>
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