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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.rntsoft.com" xmlns="http://www.rntsoft.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>