how to get the correct output format

Question

xquery version "1.0-ml";
let $letter := ("A","B")
let $number := (1,2,3)

for $i in $letter

for $j in $number
return ($i,$j)

How can I get the output format will be. Thanks

A
    1
    2
    3
    
B
    1
    2
    3

Answer 1

If you intend to have the indentation and carriage returns in the output:

let $letter := ("A","B")
let $number := (1,2,3)

for $i in $letter
let $line := (
   $i,
   for $j in $number
   return "    "||$j
 )
 string-join($line, "
")

More concisely, using simple map operator ! instead of for loops:

let $letter := ("A","B")
let $number := (1,2,3)
return
 string-join($letter ! (., $number ! ("    "||.)), "
")