+
+(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\">")
+
+(defvar +xhtml10-frameset-dtd-string+
+ "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Frameset//EN\" \"http://www.w3.org/TR/xhtml10/DTD/xhtml10-frameset.dtd\">")