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* The ''en:clarified butter'' line is the main name of the ingredient. Any synonyms appear after the main name, separated by comma's. The prefix ''en:'' defines the language of the main ingredient.  
 
* The ''en:clarified butter'' line is the main name of the ingredient. Any synonyms appear after the main name, separated by comma's. The prefix ''en:'' defines the language of the main ingredient.  
 
* The next lines provide translations of the main ingredient in other languages. One language per line. Each line starts with a language prefix. Thus ''de:'' means german.
 
* The next lines provide translations of the main ingredient in other languages. One language per line. Each line starts with a language prefix. Thus ''de:'' means german.
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== Categories Taxonomy==
 
== Categories Taxonomy==
 
OFF maintains a categories taxonomy to categorise products. This categories taxonomy is related to the ingredient ontology, but subtly different.
 
OFF maintains a categories taxonomy to categorise products. This categories taxonomy is related to the ingredient ontology, but subtly different.
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For example the product [https://world.openfoodfacts.org/product/20139315/beurre-gastronomique-doux-milbona Beurre Gastronomique Doux] of the brand ''Milbona'' with barcode ''20139315'' has one ingredient: [https://world.openfoodfacts.org/ingredient/pasteurized-butter Beurre pasteurisé] and belongs to the [https://world.openfoodfacts.org/category/sweet-cream-butters Sweet cream butters] category.
 
For example the product [https://world.openfoodfacts.org/product/20139315/beurre-gastronomique-doux-milbona Beurre Gastronomique Doux] of the brand ''Milbona'' with barcode ''20139315'' has one ingredient: [https://world.openfoodfacts.org/ingredient/pasteurized-butter Beurre pasteurisé] and belongs to the [https://world.openfoodfacts.org/category/sweet-cream-butters Sweet cream butters] category.
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== Maintenance ==
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== Issues ==
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=== Language codes ===
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OFF seems to use the short ISO 639-1 [https://www.loc.gov/standards/iso639-2/php/code_list.php language codes]. The consequence is that not all languages that are found on Wikipedia can be implemented in OFF. For instance the language [https://fur.wikipedia.org/wiki/Lenghe_furlane Furlan], does not have a ISO 639-1 code, but does have a ISO 639-2 code (fur).
 
[[Category:Ingredients]]
 
[[Category:Ingredients]]
 
[[Category:Products]]
 
[[Category:Products]]
 
[[Category:Ontology]]
 
[[Category:Ontology]]
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