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    copied!<p>You need something like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt; &lt;xs:element name="Trailer"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:choice maxOccurs="unbounded"&gt; &lt;xs:element name="TrailerField"&gt; &lt;xs:complexType&gt; &lt;xs:simpleContent&gt; &lt;xs:extension base="xs:string"&gt; &lt;xs:attribute name="name" type="xs:string" use="required" /&gt; &lt;xs:attribute name="length" type="xs:unsignedByte" use="required" /&gt; &lt;xs:attribute name="type" type="xs:string" use="required" /&gt; &lt;/xs:extension&gt; &lt;/xs:simpleContent&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;xs:element name="CountItem"&gt; &lt;xs:complexType&gt; &lt;xs:simpleContent&gt; &lt;xs:extension base="xs:string"&gt; &lt;xs:attribute name="length" type="xs:unsignedByte" use="required" /&gt; &lt;xs:attribute name="type" type="xs:string" use="required" /&gt; &lt;/xs:extension&gt; &lt;/xs:simpleContent&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:choice&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:schema&gt; </code></pre> <p>The <code>&lt;xs:choice&gt;</code> gives you the choice of any one of the elements inside the choice, and since the <code>&lt;xs:choice&gt;</code> has an attribute of <code>maxOccurs=unbounded</code>, you can have any number of repetitions therefore --> you get to choose any number of those elements included, in any order.</p>
 

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