Created
April 26, 2022 13:57
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| for $group in db:open('xpr')/xpr/expertises/expertise | |
| for $year in $group/description/sessions/ | |
| date[@when castable as xs:date]/year-from-date(@when) | |
| group by $year | |
| return $year || ' : ' || count($group/self::node()) | |
| (: The self::node() step is used in the last line to remove duplicate nodes in the resulting $group value. :) |
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