Other metadata than the ones listed SHOULD NOT be provided by the service provider : creationTime, languageCode, sourcePatientID, healthcareFacilityTypeCode, practiceSettingCode, confidentialityCode, typeCode, XDSDocumentClassCode, XDSDocumentFormatCode, XDSDocumentEntry.PatientId, XDSDocument.UniqueId (WP3A_epSOS_EED_IHE_XDR_Binding, 2.1)