Issue 17873: IsNull not Boolean (uml25-ftf)
Source: Nomos Software (Dr. Edward Willink, ed(at)willink.me.uk)
Nature: Clarification
Severity: Significant
Summary: IsNull not Boolean
Resolution: 
Revised Text: 
Actions taken:
September 26, 2012: received issue
Discussion: 
Surely the result is three-valued. null, !null, cannot compute. So Boolean[0..1].
End of Annotations:=====
s is issue # 17873

Problem: 8.067

Severity: medium
Type: Clarification
Location: 8.6 p 100 isNull()
Title: IsNull not Boolean
Discussion: 
 
Surely the result is three-valued. null, !null, cannot compute. So Boolean[0..1].
 
Source: Edward Willink