The Astro::Catalog module is an generic, object-oriented astronomical catalogue. It provides access to the online USNO-A2 and Guide Star Catalogues provided by ESO/ST-ECF, and additionally provides read/write access to ARK CLUSTER format files.
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Version 3 of the module breaks the existing API used by preceding versions. However, much new functionality is introduced that would have been hard to implement and maintain backwards compatibility. New features for V3 include pluggable I/O support, filtering, and inline sorting of retrieved catalogues. Many of the improvements are not readily noticeable by the user, as alot of work has gone into the infrastructure of the package. This means that adding additional I/O and Query support has been made much easier.