This is a UML 2.x profile for class diagrams implemented in Eclipse Papyrus for UML 4.5.
To use it, download and install Papyrus in Eclipse. You will need to download ontouml2enduranttypes.profile.uml and add it to your Papyrus project.
Create a class diagram and select the "Profile" tab on the "Properties" view. Apply ("+") the profile to your diagram. You may then create classes and in the "Profile" tab apply stereotypes. Click the right button and then "Validate->Validate Model" to run the OntoUML syntactic verification for endurant types.