def __init__(self, metadata=None, xmlns=None):
        super(XMLDictSerializer, self).__init__()
        self.metadata = metadata or {}
        self.xmlns = xmlns
Test adding an OrderDict item after a given key.
dataset/ETHPy150Open openstack/rack/rack/api/wsgi.py/XMLDictSerializer.__init__--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/markdown/regression-tests.py/TestOrderedDict.testAddAfter