coref
                  $Revision$
$Date$
coref — A cross reference to a co
coref ::= EMPTY
| 
                         Name  | 
                     
                         Type  | 
                     
                         Default  | 
                  
| label | CDATA | None | 
| linkend | IDREF | Required | 
The coref plays a role for callouts that is analagous
               to the role of footnoteref for footnotes.
            
Use one co and one or more
               coref elements when you want to indicate that the
               same callout should appear in several places.
            
Label specifies an identifying
                        number or string that may be used in presentation.
                        
                     
Linkend points to the
                        co referenced.
                        
                     
areaspec, calloutlist, co, graphicco, imageobjectco, mediaobjectco, programlistingco, screenco.