Name
The UML Model Diagram template supplies the name of the argument associated with particular template parameters. You can't change the name.
Type
If the template parameter associated with the argument has an unspecified type, bind a type to the parameter by specifying the type here. If the data type you want isn't listed, right-click a data types package in the tree view, point to New and click DataType, or create a new class.
Value
If the template parameter associated with the argument has a specific type, bind a value to the parameter by typing a value here.
Documentation
Type any documentation you want to add to the element as a tagged value. When you select the shape or icon representing the element, the documentation you type here also appears in the Documentation window.
