I have a super class that defines 3 properties.
I want to have each sub-class defined in it's own xml file.
Each sub-class will store the super classes properties in their own table so I'm not going to be using the subclass tag. Each sub-class will just be defined as a class that happens to share 3 properties.
I believe I can use an entity reference to avoid duplicating the 3 properties for each xml file.
Is there a better way?

TIA

Nope