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POXsd recursion of complexTypes
 

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    <p>I am just learning XML/XSD and am struggling with the implementation of an XML-schema which models a folder structure. What I had in mind was defining a complexType for the folder which can have additional folder instances that represent subfolders. Using the xsd schema validator <a href="http://www.validome.org/grammar/validate/" rel="nofollow noreferrer">here</a> always returns that the schema is invalid.</p> <p>I tried defining the complexType up front and then using the <em>ref</em> keyword for subfolders:</p> <pre><code>&lt;xs:complexType name="tFolder"&gt; &lt;xs:sequence&gt; &lt;xs:element name="Path" type="tFolderType" msdata:Ordinal="0" /&gt; &lt;xs:element ref="Folder" minOccurs="0" maxOccurs="unbounded" /&gt; &lt;xs:element name="File" nillable="true" minOccurs="0" maxOccurs="unbounded"&gt; &lt;xs:complexType&gt; &lt;xs:simpleContent msdata:ColumnName="File_Text" msdata:Ordinal="0"&gt; &lt;xs:extension base="xs:string"&gt; &lt;/xs:extension&gt; &lt;/xs:simpleContent&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:sequence&gt; &lt;xs:attribute name="Type" type="tFolderType" /&gt; </code></pre> <p></p> <p>As for the element itself:</p> <pre><code>&lt;xs:element name="Folder" type="tFolder" /&gt; </code></pre> <p>The error returned by the validator is: </p> <p><strong>"Cannot resolve the name 'Folder' to a(n) 'element declaration' component."</strong></p> <p>and the error occurs at the line </p> <pre><code>&lt;xs:element ref="Folder" minOccurs="0" maxOccurs="unbounded" /&gt; </code></pre> <p>Defining the complexType within the element itself yields the exact same error: </p> <pre><code>&lt;xs:element name="Folder"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="Path" type="tFolderType" msdata:Ordinal="0" /&gt; &lt;xs:element ref="Folder" minOccurs="0" maxOccurs="unbounded" /&gt; &lt;xs:element name="File" nillable="true" minOccurs="0" maxOccurs="unbounded"&gt; &lt;xs:complexType&gt; &lt;xs:simpleContent msdata:ColumnName="File_Text" msdata:Ordinal="0"&gt; &lt;xs:extension base="xs:string"&gt; &lt;/xs:extension&gt; &lt;/xs:simpleContent&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:sequence&gt; &lt;xs:attribute name="Type" type="tFolderType" /&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; </code></pre> <p>What I've read, this kind of recursion should work using <em>ref</em>.</p> <p>Can anyone tell me what I've done wrong? Maybe the xsd validator is just faulty? If so, does anyone know a better alternative? I've tried using the one from w3.org as well, but it seems to be taken offline...</p>
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