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SAX-based adapter to copy trees from/to the Python standard library.
Use the `ElementTreeContentHandler` class to build an ElementTree from
SAX events.
Use the `ElementTreeProducer` class or the `saxify()` function to fire
the SAX events of an ElementTree against a SAX ContentHandler.
See http://codespeak.net/lxml/sax.html
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SubElement( t Commentt ProcessingInstructiont SaxErrorc B s e Z d Z RS( s General SAX error.
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Z d Z e Z RS( s/ Build an lxml ElementTree from SAX events.
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