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<div class="sub-title"><span class="module-label-in-type">Module</span>&nbsp;<a href="../../../../../module-summary.html">org.apache.jena.arq</a></div>
<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.jena.sparql.expr</a></div>
<h1 title="Interface Unstable" class="title">Interface Unstable</h1>
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<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="E_BNode.html" title="class in org.apache.jena.sparql.expr">E_BNode</a></code>, <code><a href="E_Random.html" title="class in org.apache.jena.sparql.expr">E_Random</a></code>, <code><a href="E_StrUUID.html" title="class in org.apache.jena.sparql.expr">E_StrUUID</a></code>, <code><a href="E_UUID.html" title="class in org.apache.jena.sparql.expr">E_UUID</a></code></dd>
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<div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Unstable</span></div>
<div class="block">Marker interface for a function that is "unstable".
That is, it isn't really a function.
<p>
A function returns the same result value when called with the same arguments.
Some "functions" do not obey this condition on functions; they look like functions but aren't.
RAND, BNODE, UUID, STRUUID
<p>
There are also "functional forms" that have special evaluation rule. These return the same value when given the same arguments.
These are "stable".
<a href="https://www.w3.org/TR/sparql11-query/#func-forms"></a></div>
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