copy over unittests for xml_util.py
copy over unittests for xml_util.py

funginstitute/patentprocessor,funginstitute/patentprocessor,yngcan/patentprocessor,nikken1/patentprocessor,yngcan/patentprocessor,nikken1/patentprocessor,yngcan/patentprocessor,nikken1/patentprocessor,funginstitute/patentprocessor