Guides
XRF — work identifier cross-reference
CWR 2.2: cross-references the work to identifiers in other systems and databases (ISWC databases, society ids, proprietary identifiers), with validity indicators.
The exact field layout — positions, sizes, and formats — is defined in CISAC's CWR specification (CWR19-1070R1), available to CISAC members and licensees. The validator implements the full layout: drop a file on it and every XRF line is parsed field by field, with problems tied to the exact characters at fault.
Two free checks for your CWR file. Is the file correct? Every record, share and control total against the spec, each problem on its exact line. Do its writers match their registrations? Every writer cross-checked against public registration data, including works registered under another spelling or IPI. Nothing stored: check a file at cwrcheck.com.