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    feat(xcm): support json schema (for CosmWasm VM support) (#1454) · 95c3ee10
    dzmitry-lahoda authored
    # Description
    
    - What does this PR do? Allows to generate JSON schema for subset of XCM
    in std builds
    - Why are these changes needed? To support XCM messages in CosmWasm
    contracts which require Schemars to generate contract clients
    - How were these changes implemented and what do they affect? We will
    use schema feature flag to build XCM pallet with JSON schema enabled
    
    # Checklist
    
    - [x] My PR includes a detailed description as outlined in the
    "Description" section above
    - [x] My PR follows the [labeling requirements](CONTRIBUTING.md#Process)
    of this project (at minimum one label for `T`
      required)
    - [x] I have made corresponding changes to the documentation (if
    applicable)
    - [x] I have added tests that prove my fix is effective or that my
    feature works (if applicable)
    - [x] If this PR alters any external APIs or interfaces used by
    Polkadot, the corresponding Polkadot PR is ready as well
      as the corresponding Cumulus PR (optional)
    95c3ee10