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Added Nutri-Score experiment use case and properties.
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== Nutri-Score experiment ==
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In 2015, Open Food Facts was used to experiment early versions of the Nutri-Score. To help the experimentation, some products have been labelled "[https://world.openfoodfacts.org/label/nutriscore-experiment Nutriscore Experiment]". These label were not printed on the product, it was only a convenient way to group these products. Now the experiment is finished, there's no need to use this label anymore. In fact, it is now counterproductive to stay as a label:
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* it is confusing with the current Nutri-Score label
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* it is proposed automatically by the "suggest as you type" feature when a user wants to add "Nutri-Score" as a label, augmenting the confusion.
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All the Nutri-Score Experiment label will be at a better place in Folksonomy Engine.
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{| class="wikitable"
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|- style="background-color:#c0c0c0;"
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! Key (property)
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! Values
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! Description
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! Type
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! Comments
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|-
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|<code>nutriscore_experiment</code>
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|<code>yes</code>
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| Was this product part of the experiment?
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| unique value
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|There's no need to use <code>no</code> as it's the default case.
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|-
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|<code>nutriscore_experiment:grade</code>
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|<code>A</code>, <code>B</code>, <code>C</code>, <code>D</code> or <code>E</code>. Example:
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<code>C</code>
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|The Nutri-Score grade of the product at the time of the experiment.
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|closed list
 
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