The pubinfo element is a wrapper for all bibliographic information of a publication element.
<pubinfo> <pubdate type="primary"> <date> <year>1999</year> </date> </pubdate> <city>Sebastopol</city> <publisher>O'Reilly</publisher> <serial>1-56592-580-7</serial> <address>millera@dinosaurs.upenn.edu</address> <link type="url">http://www.dinosaurs.upenn.edu/</url> </pubinfo>