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    copied!<p>Maybe something like this?</p> <pre><code>&lt;schema elementFormDefault = "qualified" xmlns = "http://www.w3.org/2001/XMLSchema" xmlns:xs = "http://www.w3.org/2001/XMLSchema" xmlns:tns = "urn:cheeso.examples.2009.05.listofbooks" targetNamespace = "urn:cheeso.examples.2009.05.listofbooks" &gt; &lt;element name="Shelf" nillable="true" type="tns:BookShelf" /&gt; &lt;complexType name="BookShelf"&gt; &lt;sequence&gt; &lt;element minOccurs="0" maxOccurs="1" name="Store" type="tns:ArrayOfChoice1" /&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;complexType name="ArrayOfChoice1"&gt; &lt;choice minOccurs="0" maxOccurs="unbounded"&gt; &lt;element minOccurs="1" maxOccurs="1" name="newBook" nillable="true" type="tns:newBook" /&gt; &lt;element minOccurs="1" maxOccurs="1" name="oldBook" nillable="true" type="tns:oldBook" /&gt; &lt;/choice&gt; &lt;/complexType&gt; &lt;complexType name="Book"&gt; &lt;attribute name="name" type="string" /&gt; &lt;/complexType&gt; &lt;complexType name="newBook"&gt; &lt;complexContent mixed="false"&gt; &lt;extension base="tns:Book" /&gt; &lt;/complexContent&gt; &lt;/complexType&gt; &lt;complexType name="oldBook"&gt; &lt;complexContent mixed="false"&gt; &lt;extension base="tns:Book" /&gt; &lt;/complexContent&gt; &lt;/complexType&gt; &lt;/schema&gt; </code></pre> <p>Of course you could simplify to </p> <pre><code>&lt;schema elementFormDefault = "qualified" xmlns = "http://www.w3.org/2001/XMLSchema" xmlns:xs = "http://www.w3.org/2001/XMLSchema" xmlns:tns = "urn:cheeso.examples.2009.05.listofbooks" targetNamespace = "urn:cheeso.examples.2009.05.listofbooks" &gt; &lt;element name="Shelf" nillable="true" type="tns:BookShelf" /&gt; &lt;complexType name="BookShelf"&gt; &lt;sequence&gt; &lt;element minOccurs="0" maxOccurs="1" name="Store" type="tns:ArrayOfChoice1" /&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;complexType name="ArrayOfChoice1"&gt; &lt;choice minOccurs="0" maxOccurs="unbounded"&gt; &lt;element minOccurs="1" maxOccurs="1" name="newBook" nillable="true" type="xs:string" /&gt; &lt;element minOccurs="1" maxOccurs="1" name="oldBook" nillable="true" type="xs:string" /&gt; &lt;/choice&gt; &lt;/complexType&gt; &lt;/schema&gt; </code></pre>
 

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