drop dataverse test if exists;
create dataverse test;
use dataverse test;

write output to nc1:"rttest/string_length.adm";

let $c1 := string-length("hellow")
let $c2 := string-length("")
let $c3 := string-length(null)
return {"result1": $c1, "result2": $c2, "result3": $c3}