Required Titles (Valid)

Some elements must have titles, but they can appear in one place or another:

<article>
<title>Some Article Title</title>
<para>Some content.</para>
</article>

<article>
<articleinfo>
<title>Some Article Title</title>
<author><firstname>Jane</firstname>
<surname>Doe</surname></author>
</articleinfo>
<para>Some content.</para>
</article>