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<H1>Solutions of common problems</H1>
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<H1><A NAME="SEC3" HREF="problems_toc.html#SEC3">Counting Symbol Occurrences</A></H1>
<P>
This module provides <CODE>.lido</CODE> computations that count all
ocurrences of certain symbols within a certain subtree.
<P>
The module is instantiated by
<PRE>
$/Tech/Counter.gnrc +instance=NAME :inst
</PRE>
The optional generic instance parameter <CODE>NAME</CODE>
identifies the particular instance.
<P>
The module provides the following computational roles:
<A NAME="IDX15"></A>
<A NAME="IDX16"></A>
<P>
<CODE>NAMECount</CODE>
is associated to the grammar symbols that shall be counted.
<CODE>NAMECount.NAMECount</CODE> yields the occurrence number in
the tree.
<A NAME="IDX17"></A>
<A NAME="IDX18"></A>
<P>
<CODE>NAMERootCount</CODE>
specifies the subtree containing the <CODE>NAMECount</CODE>
occurrences. The number of occurrences found in the
subtree can be obtained by the attribute
<CODE>NAMERootCount.NAMECountResult</CODE>.
<A NAME="IDX19"></A>
<A NAME="IDX20"></A>
<P>
The default is that counting starts from 1 and is incremented by
The start value can be adjusted by
overriding the computation <CODE>NAMERootCount.NAMEInitCount = 0;</CODE>
with a computation of a suitable value.
The increment can be adjusted by overriding the computation of
<CODE>NAMECount.NAMEIncrement</CODE>.
<P>
|NAME|RootCount is inherited by the grammar root by default.
<P>
<CODE>NAMERootCount</CODE> can be associated to recursive grammar
symbols. Any symbol that has <CODE>NAMECount</CODE> associated
must belong to a subtree such that <CODE>NAMERootCount</CODE> is
associated to its root.
<A NAME="IDX21"></A>
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