xml validating

How to validate each text contained in the xml file against the xsd
file i.e the data type each text should be correct as well as to check
each required attribute is present or not. and throw what type of validation error is occured in validation . can anybody suggest me the
solution

plz send me the solution very urgent

my mail address isphanikumar@axsys-healthtech.com

[507 byte] By [blastthexml] at [2008-2-3]