public boolean isEditable(DataType dt) {
		if ((dt instanceof Enum) || (dt instanceof Union) || (dt instanceof Structure)) {
			return true;
		}
		return false;
	}
Determine if the indicated data type can be edited
(i.e. it has an editor that this service knows how to invoke).
@param dt data type to be edited
@return true if this service can invoke an editor for changing the data type.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/editor/DataTypeEditorManager.java