Uniform, global, cross-repository discovery of resources is essential to establish repositories as important players in scholarly communication. Batch discovery generally supports search, but also use cases that require content transfer such as text mining and preservation. The better resources in repositories are surfaced using batch discovery mechanisms, the more likely they are to be found by users and applications alike. Supporting batch discovery to enable specialized services avoids the problem of “if it did not appear near the top of a results list, it does not exist.”