Listing 1: catalog.xml
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <xsd:element name="catalog" type="catalogType"/>

 <xsd:complexType name="catalogType">
  <xsd:sequence>
   <xsd:element ref="journal"  minOccurs="0" maxOccurs="unbounded"/>
  </xsd:sequence>
  <xsd:attribute name="title" type="xsd:string"/>
  <xsd:attribute name="publisher" type="xsd:string"/>
 </xsd:complexType>

 <xsd:element name="journal" type="journalType"/>

 <xsd:complexType name="journalType">
  <xsd:sequence>
   <xsd:element ref="article"  minOccurs="0" maxOccurs="unbounded"/>
  </xsd:sequence>
 </xsd:complexType>

 <xsd:element name="article" type="articleType"/>

 <xsd:complexType name="articleType">
  <xsd:sequence>
   <xsd:element name="title" type="xsd:string"/>
   <xsd:element name="author" type="xsd:string"/>
  </xsd:sequence>
 
  <xsd:attribute name="edition" type="xsd:string"/>
 </xsd:complexType>

</xsd:schema>

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