Search/Retrieve via URL

Search/Retrieve via URL (SRU) is a standard search protocol for Internet search queries, utilizing Contextual Query Language (CQL), a standard query syntax for representing queries.

SRU, along with the related Search/Retrieve via Web (SRW) service, were created by as part of the ZING (Z39.50 International: Next Generation) initiative as successors to the Z39.50 protocol.

Example usage
Sample code of a complete answer for this SRU Query-URL with URL query version=1.1&operation=searchRetrieve&query=dc.title=Darwinism and CQL query dc.title=Darwinism: