Bureaucrats, editor, reviewer, Administrators
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for $ppl in doc('xmark')//people/person
let $ic := $ppl/profile/@income
let $income := if($ic < 30000) then "challenge" else if($ic >= 30000 and $ic < 100000) then "standard" else if($ic >= 100000) then "preferred" else "na"
group by $income
order by $income
