  We describe a meta-querying system for databases containing queries in
addition to ordinary data. In the context of such databases, a meta-query is a
query about queries. Representing stored queries in XML, and using the standard
XML manipulation language XSLT as a sublanguage, we show that just a few
features need to be added to SQL to turn it into a fully-fledged meta-query
language. The good news is that these features can be directly supported by
extensible database technology.
