Questions on Value Validations

I am trying to set a range for a schema element and would appreciate if I can get some advice on the best way to do it.

What I am trying is to set a restriction on a simple type element, then referencing that elment in a complex type, and finally reference that complex type in a different complex type (root element).

Are there any restrictions when using <xsd:restriction> on referencing the resulting element in a different element?

If the boundary conditions are repeated for other elements, what is the cleanest way to achieve that?

Please excuse my trivial questions as I am fairly new to the subject.

Thanks for any help.

Ayman