The check box element is of type Boolean. Each checkbox UI element needs to be bound to one request class attribute. Check Box elements have a value of type Boolean. Compared to classic HTML usage where a checkbox tag usually has a value assigned, it is handled differently within the xUML UI context.
Refer to the example for more information.
Example Files (Builder project Advanced Modeling/UI):
<your example path>\Advanced Modeling\UI\uml\uiRadioGroupCheckbox.xml