I have a date-valued element range index.  I want to use it for 
sorting.  When I do that using an expression like this:

order by xs:date($doc//sort-date)

I get errors when the $doc sequence contains documents that have no 
sort-date.

What is the recommended approach to handling nulls when sorting? Ideally 
we would want them to sort last.

If I just use

order by $doc//sort-date

will the index come in to play?

-Mike Sokolov
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