The National Science Digital Library (NSDL) is the national online portal for education and research on learning in science, technology, engineering, and mathematics in the United States. The NSDL provides a XML repository search server tool called the Digital Discovery System (DDS), complete with an API built on top of Apache Lucene.
When a user uses the DDS tool in conjunction with a XML repository, they can use RESTful calls to remotely create, update, and delete collections and items in their repository using the DDS's Repository Update Service web service. Client access to a DDS repository system and, likewise, the API is governed by a list of valid IP's that can be specified in the DDS's Collection Manager interface.
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