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": "urn:ogc:def:phenomenon:temperature",
                 "metadata": {
                     "accuracy": {
                         "type": null,
                         "value": "0.1"
                     }
                 }
              }
           },
           {
              "type": "Car",
              "id": "abc345fg",
              "speed": {
                  "value": 14.7,
                  "type": null,
                  "metadata": { }
              }
           }
        ]
  
  
  ## 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)
  
          [
           {
              "type": "Room",
              "id": "DC_S1_D41",
              "temperature": 35.6
           }
          ]
  
  ### By type [GET /v2/entities{?type}]
  
  + Parameters
      + type: Room (optional, string) - Only retrieve entities of this type
  
  + Response 200 (application/json)
  
          [
           {
              "type": "Room",
              "id": "DC_S1_D41",
              "temperature": {
                 "value": 35.6,
                 "type": "urn:ogc:def:phenomenon:temperature",
                 "metadata": {
                     "accuracy": {
                         "type": null,
                         "value": "0.1"
                     }
                 }
              }
  
negative.code:             "type": "StreetParking",
              "id": "A45678",
              "availableSpotNumber": {
                "value":     11,
                "type":      "number",
                "metadata": { }
              },
              "totalSpotNumber": {
                "value":    20,
                "type":     "number",
                "metadata": { }
              },
              "location": {
  