What exactly is "DITA Lite?"

In the "DTD organization" part of the DITA 1.2 non-normative
    discussions, I see this doctype:

    
        
          
            

              Base Topic
              
                
Topic modules

                  

                  Highlight domain

                  Utilities domain

                  Indexing domain

                  Hazard Statement domain

              
            

          
        
      

    Is this was is meant by "DITA Lite?" Just looking to make sure we
    all know what the feature fully entails, for the sake of the ongoing
    complexity discussion.

    

    
-- 

      

        
 Don R. Day 

        
 DITA and XML Consultant,
          512 244-2868

          Co-Chair, OASIS
            DITA Technical Committee 

        

          
"Where is the wisdom we have lost in knowledge?

          
Where is the knowledge we have lost in information?"

          
--T.S. Eliot