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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;
 
* ''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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==== Convenience categories ====
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There are some categories that can be called convenience categories, as they limit the work a user needs to do in order to classify products.These categories combine two characteristics into one, for example the category ''potatoes'' and the label ''frozen'' are converged into one category: ''frozen potatoes''.
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==== Oppositional categories ====
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This a a pair of categories, where one is the opposite of the other. For instance the category ''sweetened beverages'' is opposite to the the ''unsweetened beverages''. Both can not be true at the same time.
    
== Examples ==
 
== Examples ==
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