A success response shall contain a Data Set according to Table K.6-1 in PS3.4 supplied in an Acceptable Media Type. See Section 8.7.5.

If (results = 0) then there are no matches, and a 200 (OK) response shall be returned with an empty payload. The empty payload shall be formatted as specified in Section 8.3.4.4.1.

A failure response payload may contain a Status Report describing any failures, warnings, or other useful information.