Hello Chuck,

Maybe I will have time to look at your code later, but the first thing that came to mind was to use `group by`:

  map:merge(
    for $pmidset at $i in $pmids
    group by $chunk as xs:integer := ($i idiv 100)
    return map:entry($chunk, $pmidset)
  )

This should give you the map you expect.

Best regards,
Nico Verwer