The GQL language is a SQL-like query language used in the Google App Engine (http://code.google.com/appengine/docs/python/datastore/gqlreference.html). It's looks like it is just a small subset of the JCR-SQL2 query language (see DNA-543), but with a small extension. Therefore, we probably do not want to reuse the JCR-SQL2 parser, but rather should implement a new parser (in case there are other diversions between the two).