<?xml version="1.0" encoding="utf-8"?>
<xs:schema 
xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
  <xs:element name="catalog">
   <xs:complexType>
    <xs:sequence>
     <xs:element ref="journal" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="title" type="xs:string"/>
    <xs:attribute name="publisher"  type="xs:string"/>
   </xs:complexType>
  </xs:element>
  <xs:element name="journal">
   <xs:complexType>
    <xs:sequence>
     <xs:element ref="article" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="date" type="xs:string"/>
   </xs:complexType>
  </xs:element>
  <xs:element name="article">
   <xs:complexType>
    <xs:sequence>
     <xs:element name="title" type="xs:string"/>
     <xs:element name="author" type="xs:string"/>
    </xs:sequence>
   </xs:complexType>
  </xs:element>
  
</xs:schema>

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