anchor.diff:  
   This generates a list of identifiers for all available items.
   
  ++ Request
  +
  +    + Headers
  +
  +            Range: items={lower_bound}:{upper_boud}
  +
   + Response 200 (application/json)
   
           [
  -            "item_id"
  +            id
           ]
   
   
  
positive.code: 
  + Response 200 (application/json)
  
          {
              "item_id": {
                  "key": "value"
              }
          }
  
  ### Create a New Item [POST]
  
  
negative.code: + Response 200 (application/json)
  
          {
              "id": id
              "key": "value"
          }
  
  