Add support for xx:Brands, needed by Hunger Games (cc @alexfauquette ) because of brands taxonomization

[teolemon]

What

• Add support for xx:Brands, needed by Hunger Games (cc @alexfauquette ) because of brands taxonomization
• Alternative: tweak Knowledge Panel for Facets to return something Hunger Games and Robotoff can digest to filter their views.

• https://world.openfoodfacts.org/facets/brands/nestle
• https://hunger.openfoodfacts.org/questions?country=en%3Aworld&type=brand&value_tag=xx%3Anestle

@stephanegigandet @alexgarel @raphael0202

[raphael0202]

It looks like we only use the prefix in the taxonomy, and that the tags in brands_tags are not prefixed with xx, ex:

https://world.openfoodfacts.org/api/v2/product/7611612142571?fields=brands,brands_tags

I think it's better to perform the change on Knowledge panel for Facet service.

[stephanegigandet]

It looks like we only use the prefix in the taxonomy, and that the tags in brands_tags are not prefixed with xx, ex:

https://world.openfoodfacts.org/api/v2/product/7611612142571?fields=brands,brands_tags

@raphael0202 Sorry for the late reply. In order not to break existing apps, we remove the xx: on API queries with a low version.
Try https://world.openfoodfacts.org/api/v3.4/product/7611612142571?fields=brands,brands_tags

See https://github.com/openfoodfacts/openfoodfacts-server/blob/main/docs/api/ref-api-and-product-schema-change-log.md#2025-03-12---product-version-1001---api-version-32---removed-ingredients_hierarchy-added-schema_version-made-brands-a-taxonomized-field

[raphael0202]

Indeed! Thank you for the heads up