http://theoryx5.uwinnipeg.ca/ppms/PAR-WebStart.ppd
  requires
  http://theoryx5.uwinnipeg.ca/ppms/XML-SAX-ExpatXS.ppd
    requires
    http://theoryx5.uwinnipeg.ca/ppms/XML-SAX.ppd
      which requires
      <INSTALL EXEC="PPM_PERL" HREF="http://theoryx5.uwinnipeg.ca/ppms/scripts/install_libexpat">install_libexpat</INSTALL>