Michael Kay wrote:
>  
> ...
>  
>  Surely an XML editor has to detect start tags and end tags as they are
>  typed, and if it detects start tags, it is trivially easy to maintain a
>  stack of open start tags? And the cost of doing so is unrelated to the size
>  of the document (only to the depth of nesting)?

Well obviously there are a variety of architectural choices that will
influence the difficulty of adding one more feature. Still, I think I
can answer this particular question generically by saying, what happens
when the user scrolls a hundred megabytes down in the document and
inserts the cursor? 

 Paul Prescod

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