Two specs are defining error reports for the CSW services:
 * OGC™ Catalogue Services — ebRIM (ISO/TS 15000-3) profile of CSW
Reference number of this OGC™ document: OGC 05 025r3
 * OGC® Cataloguing of ISO Metadata (CIM) Using the ebRIM profile of CS-W
Reference number of this OGC® document: OGC 07-038