Digital documents are widely spread around the web in information systems of all kinds. The approach described in this paper is to unify the access to documents and connect applications to share, search and publish documents in a standardised way. The sample implementation uses web services to integrate knowledge management, a learning management system, and a digital library. We propose a procedure to access resources in heterogenous repositories by negotiating capabilities before sending queries. The result is a unified service model for accessing resources, which can easily be supported by different repositories and clients.

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