Naming: "KeyMap" interfaces and classes
Soong has a concept (currently called a "keymap") which manages a persistent store maintaining the relationship between source data keys and destination keys. E.g., if an article whose unique ID in the source system was "123" is migrated into a framework using uuids, the keymap would store the relationship 123=>'uuid....'
. Any better names for this? In Drupal this was "IdMap".