Schema for Songs

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

  <xsd:complexType name="SongType">
  
    <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="1" maxOccurs="1"/>
    <xsd:element name="YEAR"   type="xsd:year" minOccurs="1" maxOccurs="1"/>

    <xsd:element name="ARTIST" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
    
  </xsd:complexType>

</xsd:schema>