 [BXJS0002] JSON serializer: <objectType> has invalid attribute "label".
Here is the xqm :
module namespace _ = 'getObjectTypes';

(:~
 : test dev YMA
 :)
declare
  %rest:path("/getObjectTypes")
(:   %rest:query-param("name", "{$name}", "anonymous friend") :)
   %output:method("json")
   %output:json("lax=yes")
function _:getObjectTypes() {
   let $db := db:open("simplePLM_test1")//objectType
   return <json objects="json">{$db}</json>
};

If instead I export in XML I get this :
<resultat>

<objectType xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" label="nodes" name="nodes"/>

<objectType xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" label="links" name="links"/>

</resultat>

using this xqm:

module namespace _ = 'getObjectTypes';

(:~
 : test dev YMA
 :)
declare
  %rest:path("/getObjectTypes")
(:   %rest:query-param("name", "{$name}", "anonymous friend") :)

   %output:method("xml")
function _:getObjectTypes() {
   let $db := db:open("simplePLM_test1")//objectType

   return <resultat>{$db}</resultat>
};

any idea?