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xquery version "3.1";
(:~
: @author Duncan Paterson
: @version 1.0:)
declare variable $local:num := math:log10(12345);
(
let $map := map { 'R': 'red', 'G': 'green', 'B': 'blue' }
return (
$map?* (: 1. returns all values; same as: map:keys($map) ! $map(.) :),
$map?R (: 2. returns the value associated with the key 'R'; same as: $map('R') :),
$map?('G','B') (: 3. returns the values associated with the key 'G' and 'B' :)
),
declare function local:city($country as node()*) as element (country) {
for $country in doc('factbook')//country
where $country/@population > 100000000
let $name := $country/name[1]
for $city in $country//city[population gt 1000000]
group by $name
return
element country { attribute type { $name },
$city/name }
};
return
('A', 'B', 'C') => count(),
<root>{local:city(.) + $local:num}</root>
|
