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I remember that the document of PUMA available on www.eclipse.org provides some information about how to extend our own query language. I’m not sure whether there’s a better way or not, we extend the PUMA query grammar by modifying PantherParser.jj, generate our own Parsers and create our own xxxNodelImpl, xxxPlugin and xxxOperatorImpl. Perhaps it will be a good idea to provide a unified structure by which user can conveniently plugin their own parsers and other related classes?