Weekend Updates

The following files have been updated:  Polymorphism Subsystem Class Diagram/Descriptions, Relationship Subsystem Class Diagram/Descriptions, Class and Attribute Subsystem Descriptions only.  Changes:  Poly - see previous news post, Relationship Subsys - Thanks to Dave Moten's eagle eyes for spotting R25 which should have been R23, Class / Relationship Descriptions, 'Specialized Class' description moved from Class to Relationship Subsystems (descriptions were out of sync with diagrams).  As always, just use the existing links, they now point to updated files.