anchor.diff:              "country": "Spain"
           }
   
  -### Update attribute value [PUT /v2/entities/{entityId}/attrs/{attrName}/value]
  +### Update attribute value [PUT /v2/entities/{entityId}/attrs/{attrName}/value{?type}]
   
   The request payload is the new attribute value.
   
  
positive.code: 
  # Group Attribute Value
  
  ## By Entity ID [/v2/entities/{entityId}/attrs/{attrName}/value]
  
  ### Get attribute value [GET /v2/entities/{entityId}/attrs/{attrName}/value]
  
  It returns the `value` property with the value of the attribute.
  
  
negative.code: 
  + Parameters
      + entityId: Bcn_Welt (required, string) - Entity ID
      + type (optional, string) - Entity type, to avoid ambiguity in the case there are several
      entities with the same entity id.
      + attrName: temperature (required, string) - Attribute to be retrieved.
  
  + Response 200 (application/json)
  