ptionally followed by a space and a 
   version number.  This method returns the first item of the list 
   returned by <code>getDOMImplementationList</code>.  As an example, 
   the string <code>"XML 3.0 Traversal +Events 2.0"</code> will 
   request a DOM implementation that supports the module "XML" for its 
   3.0 version, a module that support of the "Traversal" module for 
   any version, and the module "Events" for its 2.0 version. The 
   module "Events" must be accessible using the method 
   <code