title: XCMv4

doc:
  - audience: Runtime Dev
    description: |
      A new version of the XCM format.
      The main changes are:
      - Removed `Multi` prefix from types
      - Removed `Abstract` asset id
      - `Outcome` is now a named fields struct
      - Added `Reanchorable` trait, implemented for both `Location` and `Asset`
      - New syntax for building `Location`s and `Junction`s using slices.
        You build them like `let location = Location::new(1, [Parachain(1000), PalletInstance(50), GeneralIndex(1984)]);`
        and match on them like `match location.unpack() {
          (1, [Parachain(id)]) => ...
          (0, Here) => ...,
          (1, [_]) => ...,
        }`

crates: []