This book constitutes the thoroughly refereed post-workshop proceedings of the 7th
International Workshop on Declarative Agent Languages and Technologies DALT 2009 held in
Budapest Hungary on May 11 2009 as a satellite workshop of the 8th International Joint
Conference on Autonomous Agents and Multiagent Systems AAMAS 2009. The 11 revised full papers
presented together with 1 invited lecture and 3 invited papers from the AAMAS main conference -
substantially enhanced after the workshop - were carefully selected from 17 initial
submissions. The papers combine declarative and formal approaches with engineering and
technology aspects of agents and multiagent systems and focus especially on areas such as the
semantic web service-oriented computing web services security and electronic contracting.
