public void ImportJson(IMap map, string jsonStr)
        {
            JObject root = (JObject)JsonConvert.DeserializeObject(jsonStr);

            List<string> entityNames = new List<string>();
            foreach (JToken entToken in root["ExtractedEntities"])
            {
                entityNames.Add((string)entToken);
            }
            map.RemoveEntitiesWithName(entityNames);

            ILayer defaultLayer = map.GetOrCreateLayer("New entities");
            defaultLayer.Color = ColorRgba.Standard.Violet;

            foreach (JToken entToken in root["Entities"])
            {
                EntityInstance instance = new EntityInstance();
                instance.EntityName = (string)entToken["EntityName"];
                instance.GroupId = (int)entToken["GroupId"];
                for (int i = 0; i < instance.LayerMasks.Length; i++)
                {
                    uint mask = (uint)entToken["LayerMasks"][i];
                    instance.LayerMasks[i] = mask;
                }

                foreach (var fieldKeyValuePair in entToken["Fields"])
                {
                    JProperty property = (JProperty)fieldKeyValuePair;
                    string name = property.Name;

                    int typeId = (int)property.Value["TypeId"];
                    int numFields = (int)property.Value["NumFields"];
                    IType type = TypeFactory.Create(typeId, numFields);
                    JsonConvert.PopulateObject(property.Value.ToString(), type);

                    instance.Fields[name] = type;
                }

                bool isNew = ((bool?)entToken["IsNew"]) == true;
                if (isNew)
                {
                    instance.AddToLayer(defaultLayer);
                }
                map.Entities.Add(instance);
            }
        }