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    copied!<p>The problem is you've accidentally defined two different <code>element</code>s with the name "domain".</p> <p>This defines one, which can occur only inside <code>configuration</code>:</p> <pre><code> &lt;xs:element name="domain"/&gt; </code></pre> <p>And this defines the other, which can only occur as a root element (you can see this if you remove the <code>configuration</code> element and have <code>domain</code> as the root - it won't validate anymore):</p> <pre><code>&lt;xs:element name="domain"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:any minOccurs="0"/&gt; &lt;/xs:sequence&gt; &lt;xs:attribute name="account" type="uid" use="required"&gt; &lt;/xs:attribute&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; </code></pre> <p>Since the first definition doesn't say anything about its attributes, in your sample document the attribute "account" on your <code>domain</code> element is valid with any type.</p> <p>To define only one element, the best way is to make the <code>element</code> definition you have into a <code>complexType</code>, and refer to that (the other alternative is to move all the <code>complexType</code> stuff inside the first <code>domain</code> deinfition):</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.com/api/2.2" elementFormDefault="qualified" version="1.0" xml:lang="EN" targetNamespace="http://www.example.com/api/2.2"&gt; &lt;xs:element name="configuration"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="domain" type="domain"/&gt; &lt;!-- changed here --&gt; &lt;/xs:sequence&gt; &lt;xs:attribute name="timestamp" type="xs:normalizedString" use="optional"/&gt; &lt;xs:attribute name="version" type="xs:token" fixed="2.2"/&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;xs:complexType name="domain"&gt; &lt;!-- and here --&gt; &lt;xs:sequence&gt; &lt;xs:any minOccurs="0"/&gt; &lt;/xs:sequence&gt; &lt;xs:attribute name="account" type="uid" use="required"&gt; &lt;/xs:attribute&gt; &lt;/xs:complexType&gt; &lt;xs:simpleType name="uid"&gt; &lt;xs:restriction base="xs:string"&gt; &lt;xs:length value="36"/&gt; &lt;xs:pattern value="[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}"/&gt; &lt;/xs:restriction&gt; &lt;/xs:simpleType&gt; &lt;/xs:schema&gt; </code></pre>
 

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