public interface IModelProcessor<in TTemplate, TModel>
    {
        TModel GetElement(TModel model, TTemplate item);
    }


public class TagProcessor : IModelProcessor<IBaseSitecoreItem, TaggingModel>
    {
        public TaggingModel GetElement(TaggingModel model, IBaseSitecoreItem item)
        {

            var castedItem = item as IAssetContainerTemplate;
            if (castedItem == null) return model;

            return new SpecificTaggingModel
            {
                Id = model.Id,
                Item = model.Item,
                Name = castedItem.DisplayName.ToString(),
                Synonyms = castedItem.AssetContainerDescriptionField.Value.Split(','),
            };
        }
    }