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bzrlib/xml5.py
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        e.text = '\n'
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        if inv.root.file_id not in (None, ROOT_ID):
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            e.set('file_id', inv.root.file_id)
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        if inv.revision_id is not None:
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            e.set('revision_id', inv.revision_id)
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        for path, ie in inv.iter_entries():
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            e.append(self._pack_entry(ie))
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        return e
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    def _pack_entry(self, ie):
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        """Convert InventoryEntry to XML element"""
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        # TODO: should just be a plain assertion
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        if not InventoryEntry.versionable_kind(ie.kind):
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            raise AssertionError('unsupported entry kind %s' % ie.kind)
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        e = Element(ie.kind)
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            if format != '5':
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                raise BzrError("invalid format version %r on inventory"
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                                % format)
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        revision_id = elt.get('revision_id')
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        inv = Inventory(root_id, revision_id=revision_id)
 
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        inv = Inventory(root_id)
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        for e in elt:
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            ie = self._unpack_entry(e)
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            if ie.parent_id == ROOT_ID: