UML14 — OCL should allow the use of "let" expressions

Summary: OCL should allow the use of "let" expressions (for the sake of
readability).

Note: The lack of a "let" feature is also mentioned in the abstract for
a paper on OCL at
http://www.it.brighton.ac.uk/staff/Stuart.Kent/publications/UML98.html
along with a number of other issues:

"Specifically, the paper suggests that: the concept of flattening
collections of collections is unnecessary, state models should be
connectable to class models, defining object creation should be made more
convenient, OCL should be based on a 2-valued logic, set subtraction
should be covered more fully, and a "let" feature should be introduced."

Redundant with issue# 1689.