pecial">,</span> <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp92328832"></a><h2>Description</h2>
<p>The function extracts an attribute value from the view. The user has to explicitly specify the type or set of possible types of the attribute value to be extracted.</p>
<p>

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<div class="variablelist"><table border="0" class="va