SVG z-index

Aloha !
  
 We are about to convert one of our tools over to the new SVG standard,. It 
was originally designed with VML quite a wile ago. (yes, a LONG time ago)
 In doing research to do the conversion, one thing that is causing us to 
stop in our tracks is the lack of support for Z-index.  
 Yes, I fully understand the "painting" concept of first on, on the bottom. 
 But that seems a limited concept considering all of the millions of types 
of potential applications out there.
  
 For instance, our tool is a sort of user driven dynamic CAD tool.  we 
place object on the screen, but there are times where we need to grab an 
object and move it up a layer, or move it to the front of other objects, or 
move it behind other objects -  All on the fly.  Using VML this was easily 
done with Z-index.  I am somewhat stunned that this appears to have been 
ignored with SVG.
  
 Are there plans to correct this flaw ?
 Or am i missing something where this same functionality exists  ?

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