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<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 <xs:element name="library">
  <xs:complexType>
   <xs:sequence>
    <xs:element name="book" maxOccurs="unbounded">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="isbn" type="xs:integer"/>
       <xs:element name="title">
        <xs:complexType>
         <xs:simpleContent>
          <xs:extension base="xs:string">
           <xs:attribute name="lang" type="xs:language"/>
          </xs:extension>
         </xs:simpleContent>
        </xs:complexType>
       </xs:element>
       <xs:element name="author" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
         <xs:sequence>
          <xs:element name="name" type="xs:string"/>
          <xs:element name="born" type="xs:date"/>
          <xs:element name="dead" type="xs:date"/>
         </xs:sequence>
         <xs:attribute name="id" type="xs:ID"/>
        </xs:complexType>
       </xs:element>
       <xs:element name="character" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
         <xs:sequence>
          <xs:element name="name" type="xs:string"/>
          <xs:element name="born" type="xs:date"/>
          <xs:element name="qualification" type="xs:string"/>
         </xs:sequence>
         <xs:attribute name="id" type="xs:ID"/>
        </xs:complexType>
       </xs:element>
      </xs:sequence>
      <xs:attribute name="id" type="xs:ID"/>
      <xs:attribute name="available" type="xs:boolean"/>
     </xs:complexType>
    </xs:element>
   </xs:sequence>
  </xs:complexType>
 </xs:element>
</xs:schema>