anchor.diff:              "type": "Car",
               "id": "abc345fg",
               "speed": {
  -                "value": 14.7,
  -                "type": null,
  +                "value"   : 14.7,
  +                "type"    : "none",
                   "metadata": { }
               }
            }
         ]
   
   
  -### Key values mode [GET /v2/entities?options=keyValues]
  +## Filter entities [/v2/entities{?id}]
  +
  +### By id [GET /v2/entities{?id,options}]
  +
  ++ Parameters
  +    + id: DC_S1_D41 (optional, string) - Only retrieve entities with this id
  +    + options: keyValues (optional, string) - rendering options
   
   + Response 200 (application/json)
   
  
positive.code:             "type": "Room",
              "id": "DC_S1_D41",
              "temperature": 35.6
           },
           {
              "type": "Car",
              "id": "abc345fg",
              "speed": 14.7
           }
          ]
  
  ### Pagination [GET /v2/entities{?limit,offset,options}]
  
  + Parameters
      + options: count
      + limit: 2
      + offset: 2
  
  + Response 200 (application/json)
  
      + Headers
  
              X-Total-Count: 30
              Link: http://example.org/v2/entities?offset=4&limit=2; rel="next", http://example.org/v2/entities?offset=28&limit=2; rel="last",
              http://example.org/v2/entities?offset=0&limit=2; rel="first", http://example.org/v2/entities?offset=2&limit=2; rel="prev"
  
      + Body
  
        [
           {
              "type": "Room",
              "id": "DC_S1_D41",
  
negative.code:                "type": "urn:ogc:def:phenomenon:temperature",
                 "metadata": {
                     "accuracy": {
                         "type":  "none",
                         "value": 0.1
                     }
                 }
              }
  