"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN"
   "http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd 
"-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd 
"-//W3C//DTD HTML 4.01 Frameset//EN"
   "http://www.w3.org/TR/html4/frameset.dtd 




"-//OASIS//DTD DocBook XML V4.2CR1//EN"
   "http://www.oasis-open.org/docbook/xml/4.2CR1/docbookx.dtd 



