add as_string functionality to xml driver contents_of
add as_string functionality to xml driver contents_of

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