A field crosswalk maps the source field to a target field while a value crosswalk maps each legacy term separately.

Broadcast Archive Metadata Migration: How To Map Legacy Tags Without Losing Searchability?

A metadata migration can finish with every record transferred and still leave an archive harder to search. Broadcast archive metadata migration succeeds only when old terms, aliases, identifiers, field meanings, and time-based relationships remain retrievable after the move. The safe method is to profile the source data, build field and value crosswalks, preserve original values, […]

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