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Python parse tree definitions.
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even the comments and whitespace between tokens.
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Abstract base class for Node and Leaf.
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Compare two nodes for equality.
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A pattern is a tree matching pattern.
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Initializer. Takes optional type, content, and name.
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max: optional maximum number of times to match, default HUGE
name: optional name assigned to this match
[*] Thus, if content is [[a, b, c], [d, e], [f, g, h]] this is
equivalent to (a b c | d e | f g h); if content is None,
this is equivalent to '.' in regular expression terms.
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