This volume presents the proceedings of an internationalworkshop on the processing of declarative knowledge. Theworkshop was organized and hosted by the German ResearchCenter for Artificial Intelligence (DFKI) in cooperationwith the Association for Logic Programming (ALP) and theGesellschaft f}r Informatik (GI).Knowledge is often represented using definite clauses,rules, constraints, functions, conceptual graphs, andrelated formalisms. The workshop addressed such high-levelrepresentations and their efficient implementation requiredfor declarative knowledge bases. Many of the papers treatrepresentation methods, mainly concept languages, and manytreat implementation methods, such as transformationtechniques and WAM-like abstract machines. Several papersdescribe implemented knowledge-processing systems. Thecompetition between procedural and declarative paradigms wasdiscussed in a panel session, and position statements of thepanelists are included in the volume.