The use of open technologies and standards have made easier the integration of Web services into end-applications. These interoperable services have been organized on distributed architectures over Internet in accordance with shared functional principles. But these Web-service architectures have not resolved the distributed computing dificulty in “gluing together” multiple and independent Web services. This paper presents an approach based on Java technology and Internet standard protocols and data formats for resolving coordination problems among Web services. Interaction models based on distributed events over HTTP are supported for providing the required coordination functionality. Cooperation problems and their solutions have been studied in the prototypical context of Location-Based Services.