International Conference on Ontologies, DataBases, and Applications of Semantics for Large Scale Information Systems (ODBase 2003) -- Incrementally Maintaining Materializations of Ontologies Stored in Logic Databases -- Ontology Translation on the Semantic Web -- Compound Term Composition Algebra: The Semantics -- Dynamic Pattern Mining: An Incremental Data Clustering Approach -- International Conference on Cooperative Information Systems (CoopIS 2003) -- A Knowledge Network Approach for Implementing Active Virtual Marketplaces -- Stream Integration Techniques for Grid Monitoring -- 6th IFIP TC 11 WG 11.5 Working Conference on Integrity and Internal Control in Information Systems (IICIS 2003) -- Information Release Control: A Learning-Based Architecture -- Enforcing Semantics-Aware Security in Multimedia Surveillance.The LNCS Journal on Data Semantics is devoted to the presentation of notable work that, in one way or another, addresses research and development on issues related to data semantics. Based on the highly visible publication platform Lecture Notes in Computer Science, this new journal is widely disseminated and available worldwide. The scope of the journal ranges from theories supporting the formal definition of semantic content to innovative domain-specific applications of semantic knowledge. The journal addresses researchers and advanced practitioners working on the semantic web, interoperability, mobile information services, data warehousing, knowledge representation and reasoning, conceptual database modeling, ontologies, and artificial intelligence.