Grouping without Duplicates Issues

[David Carlisle]

> Is this not even a subquery at all?
I don't know what you mean by a subquery.


>    for $doc in distinct-values($addresses),
this takes the string value of each booklist element and returns a list
of unique strings. 

>         $head in $doc/title

this is an error $doc is a string so you can't use it to the left of /

David

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