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implement a tree walker object (called TreeWalker by convention) that
implements a 'serialize' method which takes a tree as sole argument and
returns an iterator which generates tokens.
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        * "etree": A generic walker for tree implementations exposing an
          elementtree-like interface (known to work with ElementTree,
          cElementTree and lxml.etree).
        * "lxml": Optimized walker for lxml.etree
        * "genshi": a Genshi stream

    :arg implementation: A module implementing the tree type e.g.
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    :arg kwargs: keyword arguments passed to the etree walker--for other
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    :returns: a TreeWalker class

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|�S( u�Pretty printer for tree walkers

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    :arg walker: a TreeWalker instance

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