in vs-metadata/validate.py [0:0]
def split_namespace(string):
"""
splits out the namespace and node name parts of an xml tag, if present
:param string: the tag name to extract
:return: a 2-tuple, first element being the tag and second being the namespace if present or None.
"""
matches = node_splitter.search(string)
if matches:
return matches.group(2), matches.group(1)
else:
return string, None