def CreateClassFromXMLString(target_class, xml_string, string_encoding=None):
"""Creates an instance of the target class from the string contents.
Args:
target_class: class The class which will be instantiated and populated
with the contents of the XML. This class must have a _tag and a
_namespace class variable.
xml_string: str A string which contains valid XML. The root element
of the XML string should match the tag and namespace of the desired
class.
string_encoding: str The character encoding which the xml_string should
be converted to before it is interpreted and translated into
objects. The default is None in which case the string encoding
is not changed.
Returns:
An instance of the target class with members assigned according to the
contents of the XML - or None if the root XML tag and namespace did not
match those of the target class.
"""
encoding = string_encoding or XML_STRING_ENCODING
if encoding and isinstance(xml_string, unicode):
xml_string = xml_string.encode(encoding)
tree = ElementTree.fromstring(xml_string)
return _CreateClassFromElementTree(target_class, tree)
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