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      <h1>Function Calls</h1>
      <p>A function call in XPath 2.0 takes the form <code>F ( arg1, arg2, ...) </code>. In general, the
function name is a QName. A library of core functions is defined in the XPath 2.0 and XSLT 2.0
specifications. For details of these functions, including notes on their implementation
in this Saxon release, see the <a class="bodylink" href="../functions/intro.xml">Functions</a> section. 
Additional functions are available (in a special namespace) as Saxon extensions:
these are listed in the <a class="bodylink" href="../extensions/intro.xml">Extensions</a>. Further functions may be
implemented by the user, either as XSLT
 <i>stylesheet functions</i> (see <a class="bodylink" href="../xsl-elements/function.xml">xsl:function</a>),
 as XQuery functions, 
or as Java <i>extension functions</i> (see the <a class="bodylink" href="../extensibility/intro.xml">Extensibility</a> section).</p>
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