'Converts a child of the current dom element to the specified type.'

@staticmethod
def _fill_instance_child(xmldoc, element_name, return_type):

    element = xmldoc.find(_get_serialization_name(element_name))
    if (element is None):
        return None
    return_obj = return_type()
    _ETreeXmlToObject._fill_data_to_return_object(element, return_obj)
    return return_obj
