The UML stencil for Microsoft Visio supports symbols of the UML 2.0, specified in OMG UML Superstructure Specification, formal/05-07-04, as well previous UML versions 1.5, 1.4, 1.3 and 1.1. The stencil also contains several non-normative UML symbols, that are not specified in the standard, but used in some UML books and papers. These non-normative symbols are always last items on the right-click menu, below the menu item called “non-normative”.