The service provides bibliographic search to return citations matching a submitted query. Its architecture complies with the SRU (Search/Retrieve via URL) standard promulgated by the U.S. Library of Congress which uses CQL (Common Query Language) to structure interactions with the service.
API methods support submission of a bibliographic search query stated in CQL syntax. The API returns metadata for matching resources in MODS format embedded in a SRU/W XML wrapper.
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So far, we don't have a record of any changes to this API