The tag definition's tagged value is not being displayed on the diagram

Customization > Extensibility Through Profiles, Stereotypes, Tag Definitions and Scripts > Extensibility through stereotype scripts and script items > Troubleshooting > The tag definition's tagged value is not being displayed on the diagram

This problem may be caused by the Tag Definition having a Boolean Data Type.

In accordance with UML, if the Tag Definition's Data Type is Boolean, only the name is shown if its tagged value is TRUE, and it is not shown at all if its tagged value is FALSE.