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<h1>22. Virtuoso Functions Guide - progn()</h1>
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<div id="text">
<h2>progn()</h2>
<div class="refpurpose">Calculates all given expressions and returns the result produced by the last one.</div>
<div class="funcsynopsis">
<span class="funcdef">any <span class="function">progn()</span>
</span>
(<span class="paramdef">
<span class="parameter">expn1</span> any</span>,
<span class="paramdef">
<span class="parameter">expn2</span> any</span>,
<span class="paramdef">...</span>,
<span class="paramdef">
<span class="parameter">expnN</span> any</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
This function calculates its first argument, then second argument and so on.
The results of these calculations are not used, except the result of the last expression which
is returned. The only useful application for this function is calling XPath extension functions
for side effects.
</p>
<p>
This function is not a part of library of standard XQuery 1.0 functions.
</p>
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<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">expn1, expn2, ... expnN – </span>
Expressions to be calculated.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>Any (according to the type of <span class="computeroutput">expnN</span>)</p>
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<pre class="screen">
[xmlns:fileio='http://www.example.com/file-io']
if (function-available ('fileio:printf'),
progn (
fileio:open('greeting.txt', 'wt'),
fileio:printf('Hello %s', /userinfo/name),
fileio:close(),
'File greeting.txt saved' ),
'File greeting.txt not saved' ) )
</pre>
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