-(defun xml-prologue-string ()
- "<?xml version=\"1.0\" encoding=\"iso-8859-1\" standalone=\"yes\"?>")
+(defvar +xhtml11-dtd-string+
+ "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\"")
+
+(defvar +xhtml10-strict-dtd-string+
+ "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml10/DTD/xhtml10-strict.dtd\"")
+
+(defvar +xhtml10-transitional-dtd-string+
+ "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml10/DTD/xhtml10-transitional.dtd\"")