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Validate on Request. It is the right of every node to request a validation if the local node policy requires it. A message for which no validation artifact is provided is handled locally. A rule of thumb is validate on creation either through validation artifacts such as schema types (pick one) or correct by construction process. Then validation rules depend on the contract for the transaction. A trusted partner may not require validation but the trust is contingent on criticality of the message (affect on local process or distribution). The local nodes knows its own rules for handling messages of the type encountered and can request validation. No size fits all.
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