UML22 — Could you please clarify what does the UML2 specifications intend for "provided port" and "required port"?

Could you please clarify what does the UML2 specifications intend for "provided port" and "required port"? Intuitively, it seems that a port could provide (respectively require) the interface which types it. This is in contradiction with the UML2 definition of port. Nevertheless, I belive a port should be able to require the interface tpeing it: the type of a port and its role (provide/require) should be decoupled. This is basically what the graphical front-end of Rhapsody does. It is also the same approach used for SysML ports, where direction is decoupled from the type of the port.

The idea of decoupling the type from the interface is addressed by 13080. The clarification is addressed here by the text revisions below.