Announcement: The operation of NSDL has been transferred to ISKME's OER Commons (effective December, 2014) - Read the news release.
This documentation describes the policies, procedures, and services that existed while NSDL was operated by UCAR.
Please update your client implementations accordingly.
The Search API allows developers to search for resources in the NSDL digital library and build customized search and browse interfaces for a variety of applications. Search queries operate over both the content of the resources and all related metadata including resource-level metadata, annotations, and use data/paradata.