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==== Convenience categories ====
 
==== Convenience categories ====
 
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''.
 
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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==== Implied categories ====
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It is possible to automatically apply a category to a product, based on two or more characteristics, without any intervention of the user. For instance if a ''herbal tea'' has the label ''organic'', it can be assigned the category ''organic herbal teas''. This in turn can be used user in any facet. It is possible to set up the rules for this in the taxonomies.
    
==== Oppositional categories ====
 
==== Oppositional categories ====
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* [https://world.openfoodfacts.org/category/apple-nectars/ingredient/sugar Nectars with sugar] - levering a single ingredient;
 
* [https://world.openfoodfacts.org/category/apple-nectars/ingredient/sugar Nectars with sugar] - levering a single ingredient;
 
* [https://world.openfoodfacts.org/category/apple-nectars/ingredient/sweetener Nectars with any sweetener] - levering multiple ingredients;
 
* [https://world.openfoodfacts.org/category/apple-nectars/ingredient/sweetener Nectars with any sweetener] - levering multiple ingredients;
Labels combination
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  −
Organic apple juices
     −
Unfiltered apple juices
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===== Labels combination =====
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By combining a category with a label, we filter even more.
   −
Apple juices with additives
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* Organic apple juices
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* Unfiltered apple juices
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* Apple juices with additives
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