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Derivation by extension

<?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="supportedLanguages">     <xs:restriction base="xs:language">       <xs:enumeration value="en" />       <xs:enumeration value="es" />     </xs:restriction>   </xs:simpleType>      <xs:attribute name="lang" type="supportedLanguages" />   <xs:complexType name="tokenWithLang">     <xs:simpleContent>       <xs:extension base="xs:token">         <xs:attribute ref="lang" />       </xs:extension>     </xs:simpleContent>   </xs:complexType>      <xs:element name="title">     <xs:complexType>       <xs:simpleContent>         <xs:extension base="tokenWithLang">           <xs:attribute name="note" type="xs:token" />         </xs:extension>       </xs:simpleContent>     </xs:complexType>   </xs:element> </xs:schema>