Still no luck:
JSON serializer: <testId> is typed as "string" and cannot be nested

I think I am going to move the JSON conversion to within PHP or Javascript, and keep the XQueries clean and readable.

Paul
json:serialize(
   <json type="array" objects='_'>{
       for $user in
collection("saveresult")//user[_id="1f2cda8f-a18a-44ba-8d17-73626d472306"]
       return
       <_>
         <testId>{$user/test/_id}</testId>
         <grade>{$user/user_info/user_grade}</grade>
       </_>
   }</json>
)

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