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Extensible Markup Language  |  1999-12-01  |  322 b   |  20 lines
  1. <?xml version="1.0"?>
  2. <!DOCTYPE colors [
  3.  
  4.     <!ELEMENT colors ( primary+ )>
  5.  
  6.     <!ELEMENT primary EMPTY>
  7.         <!ATTLIST primary color ( RED | GREEN | BLUE ) "RED">
  8. ]>
  9. <colors>
  10.  
  11.     <primary color="RED"/>
  12.     <primary color="GREEN"/>
  13.     <primary color="BLUE"/>
  14.  
  15.     <!-- ERROR!    
  16.     <primary color="YELLOW"/>
  17.     -->
  18.  
  19. </colors>
  20.