Allow attributes in DataTypes
DataTypes should support attributes to create structured types.
For example: http://www.uml-diagrams.org/data-type.html
Reece Hart commented
To be clear, I mean that when one creates a Data Type classifier, the frame does not have the hover options to create attributes the way Classes do. In fact, I can't figure out how to add attributes to Data Types, even though I think you must have intended to support them.
It might also be handy to have a way to convert Class → Type and vice versa.