callback({
  "database_resource_url": "http://wedata.net/databases/mail",
  "created_at": "2010-03-03T03:43:09+09:00",
  "name": "abc",
  "data": {
  },
  "updated_at": "2010-03-03T03:43:09+09:00",
  "created_by": "Kapur",
  "resource_url": "http://wedata.net/items/31704?rev=42702"
})