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In this paper we present a new approach to semantic resource discovery in the grid. A peer-to-peer network is used to distribute and query the resource catalogue. Each peer can provide resource descriptions and background knowledge, and each peer can query the network for existing resources. We do not require a central ontology for resource description and matching. Each peer has its own, possibly incomplete, ontology, which is completed by the knowledge distributed over the network. This allows to find matching resources even if the concepts used to describe the resources are unknown to the provider, as the network supplies the missing parts of the ontology.