Syntax and Semantics of Hybrid Database Languages

Abstract. We present the hybrid query language HQL/EER for an Extended Entity-Relationship model. As its main characteristic, this language allows a user to freely mix graphical and textual formulation of a query. We show how syntax and semantics of this hybrid language are formally defined by means of a slightly extended version of PROGRES, a specification formalism based on programmed and attributed graph rewriting systems.

• Type: Conference
• Year: 1993
• Where: DAGSTUHL
• Authors: Marc Andries, Gregor Engels
• Keywords: DAGSTUHL 1993, DAGSTUHL 2007, Extended Entity-relationship Model, Hybrid Language, Hybrid Query Language