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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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