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Determining If Functions Are Available

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In a query in a stylesheet, to determine whether the XPath processor supports a particular function, call the 
    <code class="cCode">function-available()</code> function. The format is
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boolean function-available(string)
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Specify a string that identifies the name of the function. The XPath processor returns 
    <code class="cCode">true</code> if it implements that function.

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