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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;
 
* ''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;
* legislation
+
* ''legislation'' - legislation might require an approach to the taxonomy. Thus the usage of juices and nectars is regulated in the EU.
 
* ''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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