This book constitutes the thoroughly refereed post-conference
proceedings of the 18th International Conference on Applications of
Declarative Programming and Knowledge Management, INAP 2009, held in
Évora, Portugal, in November 2009.

The 12 revised full papers presented together with 2 invited talks were
carefully reviewed and selected during two rounds of reviewing and
improvement. The conference comprehensively covers the impact
of programmable logic solvers in the internet society, its underlying
technologies, and leading edge applications in industry, commerce,
government, and societal services. The topics of the selected papers
concentrate on three currently important fields: foundations and
extensions of logic programming, databases and query languages,
declarative programming with logic languages, and applications thereof.