Packages 
Package Description
org.apache.commons.validator
The Validator package provides validation for JavaBeans based on an xml file.
org.apache.commons.validator.routines
This package contains independant validation routines.
org.apache.commons.validator.routines.checkdigit
This package contains Check Digit validation/calculation routines.
org.apache.commons.validator.util
This package contains utility classes used by Commons Validator.