Serialization of XDM

[David A. Lee]

Michael Kay wrote:
>
> Incidentally, one deficiency of the Saxon -wrap format that I mentioned
> earlier is that it doesn't contain any information about node identity. If
> you have a sequence of three elements with the same name and content, it
> won't tell you whether the sequence being serialized contains three distinct
> nodes, or a single node repeated three times.
>
>   

Interesting point about Node Identity.  I hadnt thought of that.
Do you have an oppionion of how important it is to preserve node identity ?
Would this be important only at the sequence level or in nested elements 
as well ?
e.g

let $a := <foo/>
return
    ( $a , $a , $a )
--->  recognize all 3 are the same

let $a := <foo/>
return
    ( <bar>{$a}</bar>,<bar>{$a}</bar>,<bar>{$a}</bar>)

--> do we need to know that all 3 <foo/> are the same ?

On first glance I can imagine the former being fairly easy, but the 
later much more complex.



David A. Lee
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