UML22 — Clarify which classifier or operation this is referring to

CollaborationUse, Constraint 2: Clarify which classifier or operation this is referring to.

There are several places in chapter 9 where the text refers to the possibility of a CollaborationUse being associated with an Operation. But there is nothing in the metamodel to support this. This issue is resolved by removing these statements from the text, and by clarifying the offending constraint.
In 9.3.3, there is a paragraph that reads as follows:
"A collaboration may be attached to an operation or a classifier through a CollaborationUse. A collaboration used in this way describes how this operation or this classifier is realized by a set of cooperating instances. The connectors defined within the collaboration specify links between the instances when they perform the behavior specified in the classifier. The collaboration specifies the context in which behavior is performed. Such a collaboration may constrain the set of valid interactions that may occur between the instances that are connected by a link."
The placement of this paragraph is peculiar, because it appears under Collaboration, not CollaborationUse. The first two sentences of this paragraph are false, because they talk about attaching a CollaborationUse to an operation. The remainder of the paragraph appears to add no value to what has been already stated in the semantics of Collaboration. I propose to delete this paragraph.