When taxonomy dimensions are retired (e.g., a motor type is split into two, a trim is reclassified), users searching for old cat values get redirected to the current ones.
- Category (
cat): a combination of dimensions likema13gr100037mt1314(make=BMW, modelGroup=1 Series, motorType=M135) - Rule: maps a retired dimension value to its replacement(s). Example: motor type "M135" (id 1314) → "1er M" (id 903)
- Patch: what a rule produces — the new dimension values to apply