You have already added support for querying the catalogue using logical conditions, but some things are still not supported, such as the RANGE function, or specifying a range of RA/DEC using the HMS/DMS functions or h/d keywords. It would be nice if this feature was expanded to include these functions, along with the SURVEY, DISCOVERY functions. All the functions I just mentioned are (as you probably know) described here, in section 2.3.