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bzrlib/bundle/serializer/__init__.py
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        raise errors.NotABundle('Did not find an opening header')
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    # Now we have a version, to figure out how to read the bundle 
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    if not _serializers.has_key(version):
 
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    if version not in _serializers:
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        raise errors.BundleNotSupported(version, 
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            'version not listed in known versions')
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    :param version: [optional] target serialization version
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    """
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    if not _serializers.has_key(version):
 
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    if version not in _serializers:
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        raise errors.BundleNotSupported(version, 'unknown bundle format')
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    serializer = _serializers[version](version)
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        _serializers[version] = klass
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        return
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    if not _serializers.has_key(version):
 
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    if version not in _serializers:
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        _serializers[version] = klass
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