XML Schema

[gautya]

I want to have a sample piece of code for following concept :
-------------------------------------
Class Entry:
Public ScreenData as Dataset

End Class

Class Screen
entry as Entry = new Entry()

Here I want to know how I can set the schema of (entry.ScreenData) from
XML schema file(XSD)
The format of XSD should contain 2 tables with 3-4 fields in each. One of
the field(in any table) is having value based on other 2 columns of the
same table.(Please see following the table defs.)Can such formula also be
put in XSD file?
I also want to know the steps of reading this schema and setting it to
schema of the above dataset.

End class


Table definitions:
Table SingularData--
Column : A char (5)
Column : B numeric (6)
Column : C numeric (4)
Column : D char (9) = Concatenation of A and C


Table MultipleData--
Column : E char (5)
Column : F numeric (6)

No relation between above 2 tables.No constrains for any table.I have taken the data types as a sample and not actual one.