1<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> 2<book xmlns:xi="http://www.w3.org/2001/XInclude" id="test" lang="en"> 3 <title>Test processing instructions</title> 4 <para><?dbtimestamp format="Y-m-d H:M:S"?></para> 5</book>