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=== Categories ===
 
=== Categories ===
The categories taxonomy is more complicated as there is not a clear relationship with what is found on the product. The nam of the products is not always well matched to the ingredients. Assigning the correct is a combination of interpreting marketing names, ingredient lists and labels found on the packaging. Often also knowledge of the current taxonomy and its hierarchy is required. And their is also a relationship with legislation, as naming a product is not always free.
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The categories taxonomy is more complicated as there is not a clear relationship with what is found on the product. The name of the products is not always well matched to the ingredients. Assigning the correct is a combination of interpreting marketing names, ingredient lists and labels found on the packaging. Often also knowledge of the current taxonomy and its hierarchy is required. And their is also a relationship with legislation, as naming a product is not always free.
    
There are some basic principles behind the hierarchy found in the taxonomy;
 
There are some basic principles behind the hierarchy found in the taxonomy;
    
* ''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;
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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. We might want to call it '''Meat lasagnas'''.
 
* ''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;
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* ''recipe complexity'' -
 
* ''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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