Extension Declaration Params

• What it is (identify extension)

  • The URI of the extension points to a definition of that extension
  • This can be a formal interface description, a piece of code, a textual description, or nothing at all (may not be resolvable)

• How to deal with it

  • optional or mandatory

• Who should deal with it

  • hop-by-hop or end-2-end

• When to deal with it

  • ordering

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