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Merge bzr.dev.

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bzrlib/xml_serializer.py
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# importing this module is fairly slow because it has to load several
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# ElementTree bits
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from bzrlib import registry
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from bzrlib.trace import mutter, warning
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try:
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        elementtree.ElementTree._raise_serialization_error(text)
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elementtree.ElementTree._escape_cdata = _escape_cdata
 
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class SerializerRegistry(registry.Registry):
 
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    """Registry for serializer objects"""
 
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format_registry = SerializerRegistry()
 
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format_registry.register_lazy('4', 'bzrlib.xml4', 'serializer_v4')
 
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format_registry.register_lazy('5', 'bzrlib.xml5', 'serializer_v5')
 
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format_registry.register_lazy('6', 'bzrlib.xml6', 'serializer_v6')
 
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format_registry.register_lazy('7', 'bzrlib.xml7', 'serializer_v7')