As context-aware systems become more widespread and mobile there is an increasing need for a common distributed event platform for gathering context information and delivering to context-aware applications. The likely heterogeneity across the body of context information can be addressed using runtime reasoning over ontology-based context models. However, existing knowledge-based reasoning is not typically optimised for real-time operation so its inclusion in any context delivery platform needs to be carefully evaluated from a performance perspective. In this paper we propose a benchmark for knowledgebased context delivery platforms and in particular examine suitable knowledge benchmarks for assessing the ability of platforms to deal with semantic interoperability. 1.

This paper proposes a proactive approach to web service discovery which contrasts the passive approach exhibited by UDDI. The paper describes how a content based network implementation (Siena) has been extended to undertake matching based on ontological reasoning, resulting in a flexible knowledge-based delivery mechanism. In particular, it describes how this implementation has been used to support the proactive and potentially more efficient delivery of advertised web service profiles to users interested in services of those types.

Abstract — This paper proposes an open, extensible control plane for a global event service, based on semantically rich messages. This is based on the novel application of control plane separation and semantic-based matching to Content-Based Networks. Here we evaluate the performance issues involved in attempting to perform ontology-based reasoning for content-based routing. This provides us with the motivation to explore peer-clustering techniques to achieve efficient aggregation of semantic queries. The clustering of super-peers using decentralized policy engineering will deliver the incremental deployment of new peer-clustering strategies. 1.

Abstract. Web service technology has been proposed to implement management interfaces of managed resources. These web services can usually be combined to perform composite processes. These composite processes can be defined with service ontologies such as OWL-S, which allows their formal description. However, other technologies, including the Web Services Business Process Execution Language (WSBPEL), provide more mature execution engines. This paper presents an approach to define and execute composite network management processes with existing technology. For this, a use case is developed in which a set of web service interfaces are defined for a network probe, and a composite process is specified using OWL-S to monitor the network load. Then, this specification is later translated to WSBPEL and interpreted by a real execution engine.