从数据库设计决策导出的XML，JSON

I need to move math league data between two different systems, both written in Java. The data is coming from a Java web application, backed by a MySQL Database, where I have tables of Schools and Students, both with unique id numbers. The data needs to be exported into a format I can read off-line with a desktop client used to record scores on the day of a tournament event in February.I need to move math league data between two dif