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      <h1>prefix-from-QName</h1>
      <p>Extracts the prefix component of a QName value. Returns
    an empty sequence if the QName has no prefix.</p>
      <p class="subhead">prefix-from-QName($arg as xs:QName?) &#8594; xs:NCName?</p>
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               <p>
                     <i>Arguments</i>
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               <p> </p>
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               <p>$arg</p>
            </td>
            <td valign="top" width="150">
               <p>xs:QName?</p>
            </td>
            <td valign="top" width="200">
               <p>The QName whose prefix component is required</p>
            </td>
         </tr>
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                style="border-top:solid 1px #3D5B96; border-bottom:solid 1px #3D5B96;">
               <p>
                     <i>Result</i>
                  </p>
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            <td style="border-top:solid 1px #3D5B96; border-bottom:solid 1px #3D5B96;"
                colspan="2">
               <p>xs:NCName?</p>
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      <p class="subhead">Links to W3C specifications</p>
      <p>Namespace: http://www.w3.org/2005/xpath-functions</p>
      <p>Applies to: XPath 2.0, XSLT 2.0, XQuery 1.0 and later versions</p>
      <p>
            <a href="http://www.w3.org/TR/xpath-functions/#func-prefix-from-QName"
            class="bodylink">XPath 2.0 Specification</a>
         </p>
      <p>
            <a href="http://www.w3.org/TR/xpath-functions-11/#func-prefix-from-QName"
            class="bodylink">XPath 3.0 Specification</a>
         </p>
      <p class="subhead">Notes on the Saxon implementation</p>
      <p>The function is fully implemented according to the W3C specifications.</p>
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               <p align="right"><a class="nav" href="QName.xml">Next</a></p>
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