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      <h1>XQuery 3.0 Conformance</h1>
      <p>Saxon 9.4 implements nearly all the new features
         of the XPath 3.0 specification. At the time of writing the Working Groups are preparing a new Working Draft which is
         intended to have "Last Call" status; it is this working draft that has been used as the basis for this release.</p>
      <p>See also <a class="bodylink" href="../conformance/xpath30.xml">XPath 3.0 Conformance</a>; all the new features implemented for XPath 3.0 are also
      available in XQuery 3.0.</p>
      <p>Other new features that are fully implemented include the following:</p>
      <ul>
         <li>
            <p>Group by clause in FLWOR expressions</p>
         </li>
         <li>
            <p>Tumbling window and sliding window in FLWOR expressions</p>
         </li>
         <li>
            <p>Count clause in FLWOR expressions</p>
         </li>
         <li>
            <p>Outer joins, represented by the syntax <code>allowing empty</code> in a FLWOR expression</p>
         </li>
         <li>
            <p>Try/Catch expressions</p>
         </li>
         <li>
            <p>Private functions and variables</p>
         </li>
         <li>
            <p>Switch expressions</p>
         </li>
         <li>
            <p>Computed namespace constructors</p>
         </li>
         <li>
            <p>Output declarations to control serialization</p>
         </li>
         <li>
            <p>Decimal format declarations to control use of the <code>format-number</code> function.</p>
         </li>
         <li>
            <p>Validation against a named type</p>
         </li>
         <li>
            <p>Default values for external variables</p>
         </li>
      </ul>
      <p>Maps are implemented in XPath 3.0 as described in the XSLT 3.0 specification. This is true whether or not the XPath
      processor is being invoked in an XSLT context.</p>
      <p>The main omissions are: function annotations other than private and public; annotations on inline functions; annotation
      assertions; some options for casting to union types (casting from string to a union type is fully supported).</p>
      <p>For details of the function library supported, see <a class="bodylink" href="../functions/intro.xml">XSLT 2.0 and XPath 2.0 Functions</a>.</p>
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