Very telling is this, quoted from that link

 http://lists.w3.org/Archives/Public/public-html/2011Feb/0085.html :

 

"== Uncontested observations:
...

 

* Experience has shown that users find prefixes confusing and don't
   understand the relationship between a prefix and a namespace."

I think this point made by the HTML5 world has to be especially taken

on board in the XML world.

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Stephen D Green