def version_ok(self,version):
        return self.attribute is None or self.format is None or \
            str(version)!="unknown" and version >= self.requested_version
Merge in another mapping, giving precedence to self
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/setuptools-0.6c11/setuptools/depends.py/Require.version_ok--crossover with--dataset/ETHPy150Open duerrp/pyexperiment/pyexperiment/utils/HierarchicalMapping.py/HierarchicalMapping.merge