Service API
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Search Service API

The Digital Discovery System Search Service (DDSWS) is a search and retrieval service API for items that reside in a digital repository, and is available from the Digital Discovery System (DDS) and the NSDL Collection System (NCS). Service requests are expressed as HTTP argument/value pairs and responses may be returned as XML or JSON.

The service is illustrated and described formally here:

  • Documentation - The documentation describes the service in detail, with service examples and information about each of the requests and search APIs.
  • Example Code - The examples provide functional code that illustrate using the service, which are free to copy, modify and use.
  • Explorer - The Search Service explorer allows you to issue each of the available requests to the service and view the XML response using your web browser.

To access this DDS repository using the service, use the following Base URL:

  • Base URL =

Previous versions

Previous versions of the service are available for reference: Search Service API v1.0 and ODL Search Service.

University Corporation for Atmospheric Research (UCAR) National Science Foundation (NSF) National Science Digital Library (NSDL)