File: Schema.xsd <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.java2s.com" xmlns="http://www.java2s.com" elementFormDefault="qualified"> <xs:simpleType name="USA_SSN"> <xs:restriction base="xs:string"> <xs:pattern value="[0-9]{3}-[0-9]{2}-[0-9]{4}" /> </xs:restriction> </xs:simpleType> </xs:schema>