# compatibility
Dataset and record IDs are opaque permanent identifiers and must not be recycled. New optional fields may be added within schema major 1. Removing a field, making an existing field required or nullable, or changing its type, meaning, primary key or money unit requires a new schema major. A public release and tombstone ledger is still needed to make non-reuse independently auditable across time.

# title
TaxSorted UK politics open-data responses