reduce memory usage for each XMLPatent class
reduce memory usage for each XMLPatent class

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