This is a draft description of the REST-interface of CLARIN Metadata Repository. Especially the response description is very sketchy yet. This interface provides summary of the basic collections hierarchy in which the MdRecords are organised handles identifying the examined collection how deep in the collection hierarchy tree to go This interface provides summary of the xml structures used in the MdRecords just default simple paths: Components/olac handles identifying the collection This interface provides actual search-functionality. The query-format is XPath, the result is based on SRU/CQL standard (searchRetrieveResponse), individual records are full MDRecords (root elem: CMD).