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* ''understandable'' - no abstract categories that a user does not understand or encounters in the supermarket aisles;
 
* ''understandable'' - no abstract categories that a user does not understand or encounters in the supermarket aisles;
* ''marketing driven'' - some categories correspond to a category in the users mind, as it has often been used in the marketing message. For instance [https://world.openfoodfacts.org/category/bolognese-lasagne Bolognaise lasagnas] is clear to the user. We might want to call it '''Meat lasagnas'''.
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* ''marketing driven'' - some categories correspond to a category in the users mind, as it has often been used in the marketing message. For instance [https://world.openfoodfacts.org/category/bolognese-lasagne Bolognaise lasagnas] is clear to the user.
 
* ''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'' - the products that OFF covers goes from basic food, like potatoes that just come out the ground to fancy ready to eat meals. And everything in-between;
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* ''recipe complexity'' - the products that OFF covers goes from basic food, like [https://world.openfoodfacts.org/category/potatoes potatoes] that just come out the ground to fancy ready to eat [https://world.openfoodfacts.org/category/meals meals]. And everything in-between:
* ''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;
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* ''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. it mould be possible to define the category Foods from Italy of Foods from the EU and combine it with the origins taxonomy;
 
* ''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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