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 201 (application/json)
  
      + Headers
  
              Location: /items/{item_id}
  
      + Body
  
              {
                  "key": "value"
              }
  
  ## Items Count Collection [/items/count]
  
  ### Read items count [GET]
  
  
negative.code: 
  + Response 200 (application/json)
  
          [
              {
                  "id": id
                  "key": "value"
              }
          ]
  
  ### Create a New Item [POST]
  
  