W3C XML Schemas

• An XML syntax that's an alternative and/or supplement to DTDs

• Data typing of element and attribute content

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<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/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:string"
                   minOccurs="1"    maxOccurs="1"/>
      <xsd:element name="YEAR"      type="xsd:gYear"
                   minOccurs="1"    maxOccurs="1"/>
      <xsd:element name="ARTIST"    type="xsd:string"
                   minOccurs="1"    maxOccurs="unbounded"/>
      <xsd:element name="PRICE"     type="xsd:string"
                   minOccurs="0"    maxOccurs="1"/>
    </xsd:sequence>
  </xsd:complexType>

</xsd:schema>

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