poster wrote:
> 1. Does XXE support key and keyref in schema?

Yes, XXE fully supports W3C XML schemas, and this includes key and keyref.



> 2. What corresponding UI support is available e.g. to select elements for a
> keyref?

There is no UI support other than reporting validation errors when you 
save your document.

It is of course possible to write a custom command in Java[tm] which 
does what you want.



> 3. Is there an evaluation version of Profession Edition to check out things
> like this?

No but you can use Standard Edition to check features like this one. See 
  http://www.xmlmind.com/xmleditor/user_faq.html#try_pro_edition


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