IPv6 addresses are easier to describe using a simple regex
<?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="ipv6_Address"> <xs:restriction base="xs:string"> <xs:pattern value="([A-Fa-f0-9]{1,4}:){7}[A-Fa-f0-9]{1,4}" /> </xs:restriction> </xs:simpleType> </xs:schema>