W3C XML Schemas

• An XML syntax to replace DTDs

• Data typing of element and attribute content

---

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/1999/XMLSchema">
 
  <xsd:element name="SONG" type="SongType"/>

  <xsd:complexType name="SongType">
    <xsd:sequence>
      <xsd:element name="TITLE" type="xsd:string" 
                   minOccurs="1" maxOccurs="1"/>
      <xsd:element name="COMPOSER"  type="xsd:string" 
                   minOccurs="1" maxOccurs="unbounded"/>
      <xsd:element name="PRODUCER"  type="xsd:string" 
                   minOccurs="0" maxOccurs="unbounded"/>
      <xsd:element name="PUBLISHER" type="xsd:string" 
                   minOccurs="0" maxOccurs="1"/>
    
      <xsd:element name="LENGTH" type="xsd:timeDuration" 
                   minOccurs="0" maxOccurs="1"/>
      <xsd:element name="YEAR"   type="xsd:year" 
                   minOccurs="1" maxOccurs="1"/>
  
      <xsd:element name="ARTIST" type="xsd:string" 
                   minOccurs="1" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:complexType>

</xsd:schema>

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• Not finished!