Towards practical meta-querying
Jan Van den Bussche, Stijn Vansummeren, Gottfried Vossen
TL;DR
This paper introduces a meta-querying system that enables querying over stored queries in databases by extending SQL with minimal features, leveraging XML and XSLT for representation and manipulation.
Contribution
It demonstrates how to extend SQL with a few features to support meta-querying, utilizing XML and XSLT, and shows these can be supported by extensible database technology.
Findings
Meta-querying can be implemented with minimal SQL extensions.
Stored queries are represented in XML for flexibility.
Extensible database technology supports the proposed meta-query features.
Abstract
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.
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