What does <?..?> mean in XML?
<p>What does <code>&lt;?..?&gt;</code> mean in XML?</p>

<p>Example:</p>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;tests&gt;
&lt;test&gt;&lt;?xml-multiple ?&gt;
&lt;/test&gt;
&lt;/tests&gt;
</code></pre>

<p>I want to know what <code>&lt;?xml-multiple ?&gt;</code> means in the above XML? I syntax-checked this XML in <strong>w3schools</strong>, there is no error.</p>