XSL Namespace Confusion

  I've been using the following for my stylesheet namespace attribute:
  
          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  
  but recently I've seen a reference to the following:
  
          xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
  
  Is the second one legal?  Is it more proper, equivalent or and order 
  version (a la ".../WD/...") than the first?
  
     Steve


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