On Feb 19, 2020, at 10:01 AM, thufir <hawat.thufir@gmail.com> wrote:

where I'm trying to use attributes because I'm not sure how to conditionally nest tags.  But, this is interesting.  Not quite sure on syntax to set and then conditionally increment $x, however.

Does “conditionally nest tags” mean that you want to make the person[@numerical=“true”] elements children of the immediately previous person[@numerical=“false”] elements ? 

If that is the case you can use “group by” 


— Steve M.