docbook-xml-4.4.zip
  http://www.docbook.org/xml/4.4/docbook-xml-4.4.zip
  http://www.oasis-open.org/docbook/xml/4.4/docbook-xml-4.4.zip
docbook-xml-4.5.zip
  http://www.docbook.org/xml/4.5/docbook-xml-4.5.zip

docbook-xsl-1.71.0.tar.bz2
  http://prdownloads.sourceforge.net/docbook/docbook-xsl-1.71.0.tar.bz2?download
docbook-xsl-1.71.1.tar.bz2
  http://downloads.sourceforge.net/docbook/docbook-xsl-1.71.1.tar.bz2?use_mirror=puzzle