UML25 — Bidirectional messages to a port object

How do required and provided interfaces on a port support messages from
both inside and outside the composite? Messages to a port object sent
from the inside of the containing composite must be declared in the
required interface of the port object, but usually messages sent to an
object must also be declared in the provided interfaces. Is there a
special case for ports? Didn't see anything in the spec explaining
this.

Discussion
This issue has already been resolved by, or no longer applies to, the UML 2.5 Beta 1 specification.
Disposition: Closed - No Change