From dictionary =>
Standard:something of usual or accepted kind.
Well,this is OpenGL for 3D graphic.
DirectX is Only and Exclusive for Windows. No comment!!
Even though the DirectX wrapper will be enables just with the standard OpenGL "driver" (which itself is the wrapper) and not with third party drivers (such as ATI's or nVidia's) this is a deliberate political act TO BLAME! OpenGL IS A STANDARD (by all means), DirectX is Microsoft's standard.