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<h1>22. Virtuoso Functions Guide - every</h1>
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<div id="text">
<h2>every</h2>
<div class="refpurpose">Returns true if all items of given sequence matches given criterion.</div>
<div class="funcsynopsis">
<span class="funcdef">boolean <span class="function">every</span>
</span>
(<span class="paramdef">
<span class="parameter">varname</span> string</span>,
<span class="paramdef">
<span class="parameter">test_set</span> sequence</span>,
<span class="paramdef">
<span class="parameter">test_expn</span> boolean</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
The function creates a temporary local variable, whose name is specified by
<span class="computeroutput">varname</span> argument.
Then, for every item of <span class="computeroutput">test_set</span> sequence it
calculates the <span class="computeroutput">test_expn</span> boolean expression
having set the created variable to that "current" item.
If the value of expression is false, the function immediately returns
false without processing the rest of <span class="computeroutput">test_set</span> sequence.
If all items of the sequence are probed without getting false,
true is returned. (So if the sequence is empty, the function returns true).
</p>
<p>
In any case, temporary variable is destroyed on return.
</p>
<p>
This function is used in the implementation of
"EVERY" logical operator in XQUERY, so you will probably use that operator
in XQUERY expressions, not the function.
This function may be useful in XPATH expressions and in XSLT stylesheets.
It is not a part of library of standard XQUERY 1.0 functions.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">varname – </span>
Name of temporary variable</div>
<div class="refsect2">
<span class="refsect2title">test_set – </span>
Sequence of items; these items will be tested by <span class="computeroutput">test_expn</span>
</div>
<div class="refsect2">
<span class="refsect2title">test_expn – </span>
Boolean expression which should be calculated for items of <span class="computeroutput">test_set</span>.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>Boolean</p>
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<div class="refsect1">
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<a name="xpf_ex_every" />
<div class="example">
<div class="exampletitle" />
<p>This expression returns true if all reports have positive incomes recorded.</p>
<div>
<pre class="screen">every('income_value', /report/income, $income_value > 0)</pre>
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