Changes for the Explain-- DTD, version 1.5
  28th March 2002
  
  Changes between versions
  1.4
  and
  1.5
  (Thu, 28 Mar 2002 20:36:36):
  
   - The top-level authoritative attribute is now
	#IMPLIED, whereas previously it defaulted to
	false.
   
 - New <authentication> element added to
	<serverInfo>; may contain a simple ``open
	authentication token'' or subelements:
	
	 - <user>
	 
 - <group>
	 
 - <password>
	
 
    - Removed old boolean authentication attribute
	from <serverInfo>.
   
 - Added optional attributeSet element to 
	<name> within <map>.