Convert from Base 10

convert-from-base-10.xqy

xquery version "3.1";

(: Converts positive integers between base 10 and base 2-10 :)

declare function local:convert-base($num as xs:integer, $base as xs:integer) as xs:integer*
{
  if ($num > 0 and ($base gt 1 and $base lt 11)) 
  then local:join-nums((local:convert-base($num idiv $base, $base), $num mod $base))
  else ()
};

declare function local:join-nums($num as xs:integer*) as xs:integer
{
  xs:integer(fn:string-join($num))
};

local:convert-base(1024,2)

There are surely more elegant ways to accomplish this conversion. If you know a better method in XQuery, I'd be glad to compare it to mine. Thanks!