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8.2.1.3 Dependency conditions

To define dependencies between different signatures, there are two conditions:

requires-signature [! id]
Defines the current signature to match only if the signature given by id matches for the same connection. Using `!' negates the condition: The current signature only matches if id does not match for the same connection (this decision is necessarily deferred until the connection terminates).
requires-reverse-signature [! id]
Similar to requires-signature, but id has to match for the other direction of the same connections than the current signature. This allows to model the notion of requests and replies.