<xs:element name="PAN" minOccurs="0"> <xs:simpleType> <xs:restriction base="nonEmptyString"> <xs:length value="10" /> <xs:pattern value="[A-Z][A-Z][A-Z][A-Z][A-Z]\d\d\d\d[A-Z]" /> </xs:restriction> </xs:simpleType> </xs:element>