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<h1>22. Virtuoso Functions Guide - tuple()</h1>
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<div id="text">
<h2>tuple()</h2>
<div class="refpurpose">Selects the first item of every argument sequence and returns the sequence of the selected items</div>
<div class="funcsynopsis">
<span class="funcdef">sequence <span class="function">tuple()</span>
</span>
(<span class="paramdef">
<span class="parameter">seq1</span> sequence</span>,
<span class="paramdef">
<span class="parameter">seq2</span> sequence</span>,
<span class="paramdef">
<span class="parameter">...</span>
</span>,
<span class="paramdef">
<span class="parameter">seqN</span> sequence</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
This function calculates all given arguments from left to right,
and creates a sequence which contains the first item of the first calculated sequence,
then the first item of the second calculated sequence and so on.
If the value of an argument is not a sequence, but a scalar,
the scalar is treated as one-element sequence so it is added into the result.
If the value of an argument is an empry sequence, the empty string is
added into the result.
</p>
<p>
This function is not a part of XPATH 1.0 or XQUERY 1.0 libraries of standard functions.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">SeqI – </span>
The sequence of items, first of its items will be used as I-tn item of the resulting sequence</div>
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<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>Sequence</p>
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<pre class="screen">tuple(/title, /abstract, /intro)</pre>
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