SYSML2 — Add a distinguished attribute to capture the textual body of a requirement

A requirement should include a text body to capture the shall statement or other human readable requirement statement. The doc annotating element is one way to accomplish this. However, a doc element on a requirement definition is inherited by its requirement usages, but it cannot be redefined on its usage. (Note: The texts of a RequirementUsage are the bodies of the documentation of the RequirementUsage.)

The proposal is to add a distinguished attribute to capture the text body of a requirement that would replace the derived text attribute/documentation. This distinguished attribute can be redefined. This avoids a requirement usage from having both the original text in the requirement definition and the modified text in the usage.

The concrete syntax should be updated accordingly.

Defer

The FTF considers this issue to have merit, but, due to lack of time, is deferring it to a future FTF or RTF.