def get_knownns(self, prefix):
        global nsdict
        for ns,p in nsdict.items():
            if p == prefix: return ns
        return None
Odfpy maintains a list of known namespaces. In some cases a prefix is used, and
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/tablib-0.10.0/tablib/packages/odf/element.py/Element.get_knownns