Web Services Modeling and Process Management -- An Analysis of Web Services Workflow Patterns in Collaxa -- Aspect-Oriented Programming for Dynamic Web Service Monitoring and Selection -- Semantically Extensible Schemas for Web Service Evolution -- Web Services Security and Knowledge Management -- A Profile Based Security Model for the Semantic Web -- A Framework for Authenticated Web Services -- Development of Semantic Web Services at the Knowledge Level -- Web Services Discovery -- A Directory for Web Service Integration Supporting Custom Query Pruning and Ranking -- Specification and Execution of Declarative Policies for Grid Service Selection -- Decentralized Web Service Organization Combining Semantic Web and Peer to Peer Computing -- Web Services Infrastructure -- Modeling the Variability of Web Services from a Pattern Point of View -- Managers Don’t Code: Making Web Services Middleware Applicable for End-Users -- SOAP Processing: A Non-extractive Approach -- Web Services Composition and Negotiation -- Aspect-Oriented Web Service Composition with AO4BPEL -- Coupled Signature and Specification Matching for Automatic Service Binding -- Negotiation Among Web Services Using LOTOS/CADP -- Web Services Solutions -- An Investigation on Using Web Services for Micro-Payment -- Implementation of a Service Oriented Architecture at Deutsche Post MAIL -- Web Services for Integrated Management: A Case Study -- Semantics in Web Services -- A Conceptual Comparison of WSMO and OWL-S -- A Conceptual Framework for Semantic Web Services Development and Deployment -- A Proposal for a Semantic Web Service Description Format.

Welcometotheproceedingsofthe2004EuropeanConferenceonWebServices(ECOWS 2004).ECOWSisoneoftheleadinginternationalconferencesfocusingonWebservices. ECOWS2004wasaforumforresearchersandpractitionersfromacademiaandindustry to exchange information regarding advances in the state of the art and practice of Web services, identify emerging research topics, and de?ne the future directions of Web services computing. ECOWS 2004 had a special interest in papers that contribute to the convergence of Web services, Grid computing, e-business and autonomic computing, and papers that apply techniques from one area to another. This conference was called the International Conference on Web Services Europe in 2003. ECOWS 2004 was a sister event of the International Conference onWeb Services 2004 (ICWS 2004), which attracted more than 250 registered participants in San Diego, USA. Web services are characterized by network-based application components and a service-oriented architecture using standard interface description languages and u- form communicationprotocols. Industrial applicationdomainsforWebservicesinclude business-to-business integration, business process integration and management, c- tent management, e-sourcing, composite Web services creation, design collaboration for computer engineering, multimedia communication, digital TV, and interactive Web solutions. Recently, Grid computing has also started to leverage Web services to de?ne standard interfaces for business Grid services and generic reusable Grid resources. The program of ECOWS 2004 featured a variety of papers on topics ranging from Web services and dynamic business process composition to Web services and process management,Web services discovery,Web services security,Web services-based app- cations for e-commerce, Web services-based Grid computing, and Web services solu- ons.