Connection in non template can be deleted.
The ToolTip displays the ObjectClass. The Tooltip displays the ObjectClass of defining element. ToolTip displays the RelationClass. ToolTip displays the RelationClass of the defining element.
Model with invalid diagram object can be loaded. The Hints view contains the ancestry and description of the ObjectClass of element. The Hints view contains the ancestry and description of the ObjectClass of element for nondefining elements. The Hints view contains the name and description of the ObjectClass of element.
fixup: the hint actually displays ancestry