Metadata in today’s digital library systems are accessible through various incompatible interfaces and correspond to heterogeneous schemas. Clients that want to search over a number of distributed metadata sources require a solution that provides uniform and location transparent access to these systems without replicating the metadata stored therein. In this paper we describe a metadata integration approach that conceives these data sources as services in the sense of a service oriented architecture. Without forcing clients to adopt a pre-defined mediation schema, we want to give them the possibility to query multiple autonomous and distributed metadata services by formulating SPARQL queries.

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