Data binding for MaskInput

Hello,

1. I do not see value property for sap.m.MaskInput. How do I bind the value entered by the user to my model?
2. I need an sap.m.MaskInput control for my application that can accept only numbers. How can I set upper and lower limits of the numbers? Is there a way to setup type and constraints just like we do for sap.m.Input?