If you have a document that worked under the old 3.0 version of DocBook, converting it is a simple matter:
Move the <title>
element from its old position inside the <artheader> element, to a
position immediately after the <article> element at the very
beginning of the document.
Change the <artheader> tag and its
closing </artheader> tag
to <articleinfo>
... </articleinfo>.