|January 1976 to December 2001
|APS
|style="background: red; color: white;" |Only syntax
|-
|<del>January 2001 to December 2001</del>
|January 2002 to December 2004
|XML Version 2.5
|style="background: red; color: white;" |Only syntax
|-
|January 2005 to December 2005
|XML Version 4.0 ICE
|style="background: yellow;" |Maybe
|-
|January 2006 to December 2006
|XML Version 4.1 ICE
|style="background: yellow;" |Maybe
|-
|January 2007 to December 2012
|XML Version 4.2 ICE
|style="background: yellow;" |Maybe
|-
|January 2013 to September 24, 2013