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SRU/CQL
SRU- Search/Retrieve via URL - is a standard XML-based protocol for search queries, utilizing CQL - Contextual Query Language - a standard syntax for representing queries.
Specifications:
SRU 2.0 SRU 1.2 SRU 1.1 CQL
Version 1.1 was released in 2004 and 1.2 in 2007. SRU 2.0 is an OASIS Standard.
Companion Specs:
Scan Explain SRW XML Files
Also
Resources