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* ''ingredients driven'' - the ingredients determine to a large extent the category. This is most obvious for unprocessed single ingredient products;
 
* ''ingredients driven'' - the ingredients determine to a large extent the category. This is most obvious for unprocessed single ingredient products;
 
* ''recipe complexity'' -  
 
* ''recipe complexity'' -  
 +
* ''geographic origin'' - the location where a product is produced. This if often used for PGO-products. Example: [https://world.openfoodfacts.org/category/olive-oils-from-italy Olive oils from Italy]. Any hierarchy implies a sub- or super-region;
 
* ''no doubling'' - there should be no doubling, i.e. the same concept appearing in multiple taxonomies. For instance why adding ''frozen pizzas'' as a new category, when ''frozen'' is already available as a label and ''pizzas'' as a category.
 
* ''no doubling'' - there should be no doubling, i.e. the same concept appearing in multiple taxonomies. For instance why adding ''frozen pizzas'' as a new category, when ''frozen'' is already available as a label and ''pizzas'' as a category.
  
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