Astronomical catalogues – simultaneous querying and matching

We report on our experience gained by executing multiple simple cone searches on a number of published astronomical catalogues. Individual search results are fed into a catalogue cross-matcher developed by GAVO. The matcher is designed to perform a probabilistic "fuzzy outer join" based on sky-positions and their uncertainties. We describe current features of the GAVO architecture that support such simultaneous queries, and outline some requirements for future versions.