In this paper we present an enhancement of our collaborative architecture with Web Services for data access and OWL ontologies to define domain concepts. The original platform is a two-level multi-agent system where communications are made through blackboards. To improve cross-skill collaboration, we enrich shared data with domain ontologies to formally define concepts and enable the reuse of domain knowledges. We also propose to access blackboards via Web Services. In this way we take advantage of standard protocols and allow the integration and the reuse of collaborative services.