title: XSD. Different between xsd:element and xs:element?
body: <p>I reading articles about <code>XSD</code> on w3schools and here many examples. For example this:</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt;
  
  &lt;xs:element name="note"&gt;
    &lt;xs:complexType&gt;
      &lt;xs:sequence&gt;
        &lt;xs:element name="to" type="xs:string"/&gt;
        &lt;xs:element name="from" type="xs:string"/&gt;
        &lt;xs:element name="heading" type="xs:string"/&gt;
        &lt;xs:element name="body" type="xs:string"/&gt;
      &lt;/xs:sequence&gt;
    &lt;/xs:complexType&gt;
  &lt;/xs:element&gt;
  
  &lt;/xs:schema&gt;
  </code></pre>
  
  <p>But after I tried put this <code>.xsd</code> file in <code>xjc</code> - I see error log, dome like this:</p>
  
  <pre><code>The prefix "xs" for element "xs:schema" is not bound...
  </code></pre>
  
  <p>But all work correct when I change <code>xs</code> on <code>xsd</code> prefix.</p>
  
  <p>So, can somebody, clarify for me what is different between <code>xs</code> and <code>xsd</code>?</p>
  
  <p>Maybe, one prefix - it is old version and other for new version...</p>