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The contents of each parse tree node consist of a collection of attribute/value
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pairs. Internally, the nodes are simply represented by hash tables. A display of
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There are a number of other parse tree display options, for example, <tt>swig -debug-module <n></tt> will
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avoid displaying system parse information and only display the parse tree pertaining to the user's module at
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stage <tt>n</tt> of processing.