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After two decades of repository development, some conclusions may be drawn as to which type of repository and what kind of service best supports digital scholarly communication. In this regard, four types of publication repository may be distinguished, namely the subject-based repository, research repository, national repository system, and institutional repository. Two important shifts in the role of repositories may be noted and in regard to content, a well-defined and high quality corpus is essential. This implies that repository services are likely to be most successful when constructed with the user and reader in mind. With regard to service, high value to specific scholarly communities is essential. This implies that repositories are likely to be most useful to scholars when they offer dedicated services supporting the production of new knowledge. Along these lines, challenges and barriers to repository development …