<!– $Header: /home/cvsroot/w3c-xml-schema/user/examples/first-complex-types.xsd,v 1.1 2001/11/12 20:54:00 vdv Exp $ –> <xs:schema xmlns:xs=“www.w3.org/2001/XMLSchema”>

<xs:simpleType name="string255">
  <xs:restriction base="xs:token">
    <xs:maxLength value="255"/>
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="string32">
  <xs:restriction base="xs:token">
    <xs:maxLength value="32"/>
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="isbn">
  <xs:restriction base="xs:unsignedLong">
    <xs:totalDigits value="10"/>
    <xs:pattern value="\d{10}"/>
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="bookID">
  <xs:restriction base="xs:ID">
    <xs:pattern value="b\d{10}"/>
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="supportedLanguages">
  <xs:restriction base="xs:language">
    <xs:enumeration value="en"/>
    <xs:enumeration value="es"/>
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="date">
  <xs:restriction base="xs:date">
    <xs:pattern value="[^:Z]*"/>
  </xs:restriction>
</xs:simpleType>
<xs:element name="name" type="string32"/>
<xs:element name="qualification" type="string255"/>
<xs:element name="born" type="date"/>
<xs:element name="dead" type="date"/>
<xs:element name="isbn" type="isbn"/>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="available" type="xs:boolean"/>
<xs:attribute name="lang" type="supportedLanguages"/>
<xs:complexType name="elementWithID">
  <xs:attribute ref="id"/>
</xs:complexType>
<xs:complexType name="bookTmp">
  <xs:complexContent>
    <xs:extension base="elementWithID">
      <xs:sequence>
        <xs:element ref="isbn"/>
        <xs:element ref="title"/>
        <xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element ref="character" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="available"/>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>
<xs:complexType name="personType">
  <xs:complexContent>
    <xs:extension base="elementWithID">
      <xs:sequence>
        <xs:element ref="name"/>
        <xs:element ref="born"/>
        <xs:element ref="dead" minOccurs="0"/>
        <xs:element ref="qualification"  minOccurs="0"/>
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>
<xs:element name="title">
  <xs:complexType>
    <xs:simpleContent>
      <xs:extension base="string255">
        <xs:attribute ref="lang"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>
<xs:element name="library">
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="book" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
<xs:element name="book">
  <xs:complexType>
    <xs:complexContent>
      <xs:restriction base="bookTmp">
        <xs:sequence>
          <xs:element ref="isbn"/>
          <xs:element ref="title"/>
          <xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="character" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="id" type="bookID"/>
        <xs:attribute ref="available"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>
</xs:element>
<xs:element name="author">
  <xs:complexType>
    <xs:complexContent>
      <xs:restriction base="personType">
        <xs:sequence>
          <xs:element ref="name"/>
          <xs:element ref="born"/>
          <xs:element ref="dead" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute ref="id"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>
</xs:element>
<xs:element name="character">
  <xs:complexType>
    <xs:complexContent>
      <xs:restriction base="personType">
        <xs:sequence>
          <xs:element ref="name"/>
          <xs:element ref="born"/>
          <xs:element ref="qualification"/>
        </xs:sequence>
        <xs:attribute ref="id"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

</xs:schema>