Collections the correct way - no collections

gistfile1.xquery

let $docs := 
  fn:distinct-values(
    for $i in cts:search(//beef,cts:word-query("tip")) return
      fn:base-uri($i)
  )
  
let $favorites :=
  <favorites>{
    for $i in $docs return
      <doc>{$i}</doc>
  }</favorites>
  
return
  xdmp:document-insert(
    '/marc/favorites',
    $favorites
  )
(: 1 document affected - Profile 2643 Expressions PT0.326612S :)

let $docs := 
  fn:distinct-values(
    for $i in cts:search(//pork,cts:word-query("ham")) return
      fn:base-uri($i)
  )
  
let $favorites :=
  <favorites>{
    for $i in $docs return
      <doc>{$i}</doc>
  }</favorites>
  
return xdmp:node-replace(fn:doc('/marc/favorites')/favorites,$favorites)
(: 1 document affected - Profile 2144 Expressions PT0.67532S :)