xpath into docbook namespace

Hi - Docbook newb here. What is the XPath selector for <title> in the
following trivial Docbook article? The regular article/title isn't
working because of the namespace declaration, although I don't know
why.

<?xml version="1.0" encoding="utf-8"?>
<article xmlns="http://docbook.org/ns/docbook" version="5.0">
<title>I Am The Title</title>
</article>

Thank you.

Franklin