Holistic product view
One of the core features of OFF is the ability to analyse, compare and select products based on a large set of product characteristics.This only possible thanks to a large collection of taxonomies, which encode these product characteristics. The size of these taxonomies is ever more growing and more difficult to maintain.
In creating these taxonomies various assumptions are made on the structuring of the taxonomies, especially in creating the subdivisions and hierarchies. Some used principles are described.
This page describes some approaches to the clever usage of taxonomies, which uses the idea of combining facets, so that the user still can find and compare products. This approach might allow a reduction in the number of entries in some taxonomies.
The taxonomies
Ingredients
The ingredient taxonomy encodes the ingredients found on the product. This should be a one-on-one mapping between the ingredients list and the taxonomy. With this it is possible to filter out products containing a specific ingredient.
There are products where there is no ingredient list or a nicely parsable list with ingredients hidden in the text (even partially), then these can be gathered and entered as ingredients.
By exploiting the hierarchies defined in the ingredients taxonomy, it is possible to filter on a group of ingredients.
Labels
Labels are claims, logos, and other statements found on products. Sometimes these labels are statements which can be checked against the ingredients. For instance the label no added sugar, should imply that the ingredient sugar is not on the ingredient list. The labels can refer to processes in the value chain, like fair-trade or organic. These labels can be encoded on the ingredients list as well, but is a bit more obscure.
The label can also encode other claimed characteristics, which refer to processes, for example filtered, artisanal, etc.
It is also possible to add storage instructions as labels (lacking better solutions), such as frozen or refrigerated.
The hierarchy is not (yet) much developed, but it is possible to get any organic or any fair-trade label,
Categories
The categories taxonomy is more complicated as there is not a clear relationship with what is found on the product. The name of the products is not always well matched to the ingredients. Assigning the correct is a combination of interpreting marketing names, ingredient lists and labels found on the packaging. Often also knowledge of the current taxonomy and its hierarchy is required. And their is also a relationship with legislation, as naming a product is not always free.
There are some basic principles behind the hierarchy found in the taxonomy;
- understandable - no abstract categories that a user does not understand or encounters in the supermarket aisles;
- marketing driven - some categories correspond to a category in the users mind, as it has often been used in the marketing message. For instance Bolognaise lasagnas is clear to the user.
- ingredients driven - the ingredients determine to a large extent the category. This is most obvious for unprocessed single ingredient products;
- recipe complexity - the products that OFF covers goes from basic food, like potatoes that just come out the ground to fancy ready to eat meals. And everything in-between:
- raw/unprocessed products - mainly from natural/vegetable origin. Maybe some processes are allowed (cleaning/cutting)?
- extended shelf life products (?) - some processes are allowed in order to extend the shelf life of unprocessed products, like pasteurisation, pre-cooking (for cans), ..?
- geographic origin - the location where a product is produced. This if often used for PGO-products. Example: Olive oils from Italy. Any hierarchy implies a sub- or super-region. it mould be possible to define the category Foods from Italy of Foods from the EU and combine it with the origins taxonomy;
- legislation - legislation might require an approach to the taxonomy. Thus the usage of juices and nectars is regulated in the EU.
- 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.
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.
Implied categories
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.
- alcoholic
- french -
- organic
- pasteurised
Oppositional categories
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. However there will always be a unknown variant as well, die to lack of information;
- sweetened <> unsweetened
- alcoholic <> non-alcoholic
- vegan <> non-vegan
- pasteurized <> non-pasteurised
Mixed categories
Unfortunately we need to mix all these approaches depending on the various usage needs. Within one category there might be multiple (competing) approaches. Each approach should however cover all products. These approaches might be inherited as well.
Examples
Some examples of how this works in practice. Many more examples are needed.
The examples are a bit limited as only two facets can be specified at the same time.
Apple juices/nectars
Ingredients combination
By combining the category facet with an ingredients facet, it is possible to find:
- Nectars with sugar - levering a single ingredient;
- Nectars with any sweetener - levering multiple ingredients;
- Apple juices with citric acid (E300) - which is one way to see whether there are additives
- Apple juices without additives - how can I do this?
Labels combination
By combining a category with a label, we filter even more.
- Organic apple juices
- Unfiltered apple juices and its opposite Filtered apple juices;
- Apple juices without additives - this is based on the labels, but will miss out products that did not have a label.