A simple name-value association for a specific kind of issue attribute.
All implementations of IAttribute are immutable, unless they also
implement IEditableAttribute.
author: Matt Albrecht groboclown@users.sourceforge.net version: $Date: 2003/02/10 22:51:54 $ since: July 6, 2002
true if the setValue( Object ) method hasbeen called on this instance and the actual value has changed(via inspection with == and equals()),otherwise false.