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Restrict the length of the code string and the characters

<?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="iso3166_CountryCode">     <xs:restriction base="xs:string">       <xs:length value="3" />       <xs:pattern value="[A-Za-z0-9]{3}" />     </xs:restriction>   </xs:simpleType> </xs:schema>