A Middleware Architecture for Building Contract-Aware Agent-Based Services.- A Knowledge Technologies-Based Multi-agent System for eGovernment Environments.- Towards a Broker Agent in the Semantic Services Environment.- Pattern-Based Semantic Tagging for Ontology Population.- Service-Based Integration of Grid and Multi-Agent Systems Models.- Discovering Homogenous Service Communities through Web Service Clustering.- Collaborative Learning Agents Supporting Service Network Management.- A Multi-Agent Architecture for NATO Network Enabled Capabilities: Enabling Semantic Interoperability in Dynamic Environments (NC3A RD-2376).- An Agent for Asymmetric Process Mediation in Open Environments.- Towards an Emergent Taxonomy Approach for Adaptive Profiling.- Commitment-Based Service Coordination.