EDOC — Use of Derived Associations

Document: UML Profile and Interchange Models for EAI
Section: 6.2.1 (Motivation)

Description:
The last paragraph of this section (beginning "Note that these derived associations...") is not entirely clear to me. I believe that the intent is the following:

Derived associations are included in the metamodel and result in corresponding generated elements in the DTD. However, derived associations can always be computed from other information in the metamodel. Therefore, a tool would not necessarily need to store derived associations internally, though it would effectively have to compute them if it generated XML for interchange.

Recommendation:
Reword the paragraph along the lines of what I wrote above. Also, be sure, to include the appropriate constraint for every derived association to define how it can be computed.