Folksonomy Engine/Functional use cases and specifications

Note: to see the prototype of each functional use case, you need to install Folksonomy Engine client script.

Open Food Facts' apps and API share some common basic meta-features:

• Links create value: every property or value or another thing that make sense should be linked to its documentation and groups it belong to.
• All lists should be:
  • shown as table: sortable by each column; filterable; with added statistics such as number of occurrences, percentage, etc.
  • downloadable: CSV and XLSX
  • queried with a REST API
• All product's attributes (property/value pairs) should be queried with a REST API.
• KISS and wiki principles:
  • Straight to the point.
  • Everything can be modified (properties, values). Modified property/value pairs are not deleted, but archived and versioned.
  • Lowering the barrier: anyone should be able to do things easily.
  • Accept as many usages as we can: fields are not constrained and anyone should enter anything as a new property or a new value. Organisation will come later.
• If possible, main lists of products should be proposed as facets, with the possibility to be mixed with other Open Food Facts facets [create a non-blocking issue]

1. The user asks the list of properties/values pairs for a given product.

• The user selects a product (link, search result, etc.).
• The system shows the product, with the list of property/value pairs.

Rationale: this is the main usage of Folksonomy Engine. It allows to know that a product has some particular properties which are not in the traditional Open Food Facts data model.

Questions:

• should this use case allow to download all the property/value pairs at one time: the ones from the traditional data model, and the ones from Folksonomy Engine ?

Prototype (beta): https://world.openfoodfacts.org/product/9310036071174/paul-s-caramel-custard

2. The user enters a new property/value pair for a given product.

• The user selects a product (link, search result, etc.).
• The system shows the product, with a form to enter a new property/value.
• Eventually, the user search for an existing property corresponding to his need (see dedicated use case 6).
• The user enters the property (see dedicated functional use case 2.1).
• The user enters the value (see dedicated functional use case 2.2).
• The user asks the system to save the property/value pair.
• The system checks for user authentication [this part is not detailed].
• The system saves the property/value pair, with some metadata: the date and time of modification, the version, the username, and optionally a comment.
• The system archives the old property/value pair and its metadata, if any.

Rationale: to discover new properties, they have to be entered by people. Open Food Facts is a project opened to any kind of editors.

Prototype (beta): https://world.openfoodfacts.org/product/9310036071174/paul-s-caramel-custard

3. The user asks for the whole list of properties.

• The user asks for the whole list of properties: links located:
  • somewhere near the list of properties/values pairs for a given product
  • anywhere else
• The system shows the list of all the properties with, for each property, the number of products and the number of different values.
  • It should be a list for the given context: the list corresponding to the products present in the current context, eg. Open Products Facts (create specific non-blocking issue).

Rationale: the list of all properties allows:

• To explore the different properties and their usages.
• To forecast the evolution of properties and their usages.
• To observe which are the most used and the properties which are not really used.

Prototype (beta): https://world.openfoodfacts.org/keys

4. The user asks for the whole list of products with a particular property.

• The user asks for the whole list of products with a particular property (link from the list of properties, link from a product's page using this property).
• The system returns:
  • The list of all products using this property; for each product: the product's barcode, optionally the product name, the product's photo, the last modification date, the editor of the property, the value.
  • The link to the property's documentation.

Rationale: the list of products with a particular property allows:

• To explore all the product with a particular property.
• To forecast the evolution of products with a particular property.
• To observe which are the most used and the properties which are not really used.

Prototype (beta): https://world.openfoodfacts.org/key/packaging:has_character

5. The user asks for the whole list of products with a particular property/value pair.

• The user asks for the whole list of products with a particular property/pair (link from a product's page using this property/value pair).
• The system returns:
  • The list of all products using this property; for each product: the product's barcode, optionally the product name, the product's photo, the last modification date, the editor of the property.
  • The link to the property's documentation.

Rationale: this use case allows hundreds of new usages; eg. listing all the products that have been recalled last month; all products that are blue; etc.

Prototype (beta): https://world.openfoodfacts.org/key/packaging:has_character/value/yes

6. The user searches for an existing property corresponding to his need.

• The user asks the system for a keyword related to his need.
• The system list all the pages of the documentation related to this keyword; this can be:
  • pages related to properties' documentation
  • pages related to a group of properties: categories, etc.

Rationale: the suggestions made by the system in the use case 2.1, based on the property name, is not sufficient to find the relevant properties; eg. thehas_character property is namely dealing with cartoon characters: searching for cartoon won't help to find this property. Folksonomy Engine needs efficient tools to allow users reuse existing properties and not always reinvent the wheel.

2.1. The user enters a property for a given product.

• The user starts typing the name of a property.
• The system suggests back all properties containing these letters (beginning at the second letter).
• The user selects a property or continues to type.
• Back to use case 2.

2.2 The user enters the value.

• If possible, the system suggests some values based on the current values already given for the property.
• The user starts typing the content of the value.
• The system suggests back all current values related to this property and containing these letters (beginning at the second letter).
• The user selects a value or continues to type.
• Back to use case 2.

Questions

• For transparency reasons (and maybe for other reasons):
  • Should we provide a use case to let the user see the history of property/value pairs for each product? Version 2?
  • Should we provide a use case to let the users see the history of all property/value pairs for all product (something like the "recent changes" in Mediawiki/Wikipedia)? Version 2?
• Should we immediately provide use cases related to private property/value pairs for V1?
  • Eg. my_morning_diet=yes;
  • Should these use cases take care of stocks issues?
  • Could public properties be used privately?
    • CONs: one can build a big private database with Open Food Facts resources.
  • Could private properties be used publically?
  • If private properties can only be used privately, should we clearly separate them from the private ones:
    • Show another section in the product page?
    • Name them to ensure they are private; eg. private:my_prefered_product=yes
  • Should private properties be documented as well as public properties?
  • Should some properties be necessarily private? Eg. our_prefered_product=yes
  • Should the property suggestion take care of private properties?
  • Should we adopt some limits to private usage? (to take care of common resources)
    • How would it look like? Max number of property/value pairs?
• Should we take care of stock issues for V1?
  • Eg. I have three items of this product, one ending 2021-10-10, and two ending 2021-10-31.