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The CMIS standard defines a query language based on a subset of the SQL-92 grammar (ISO/IEC 9075: 1992 -- Database Language SQL), with a few extensions to enhance its filtering capability for the CMIS data model, such as existential quantification for multi-valued property, full-text search, and folder membership.
CMIS search is disabled by default in eXo CMIS. Uncomment the indexDir parameter if you need the query support in CMIS. To discover the search capability, check the capabilityQuery property (see the table below).