Commons:Depiction guidelines/fr

This proposed guideline is disputed; see Commons:Depicts.

Des descripteurs sont utilisés pour identifier et décrire ce qui est présent dans un fichier.

La propriété "depicts" (P180) de Wikidata est largement utilisée sur Wikidata pour décrire le contenu de certains éléments. Elle est aussi disponible sur Wikimedia Commons pour structurer les descriptions des médias, dans le cadre du Projet sur les données structurées dans Wikimedia Commons". En mai 2022, les déclarations (Depicts) étaient déjà utilisées pour décrire plus de =1&ns106=1 8 millions de fichiers sur Commons.

De l’importance de décrire les contenus

Langue et traduction

Dans Commons, avant l'introduction des données structurées, les informations sur les fichiers et/ou les catégories sur Commons ne pouvaient être ajoutées qu'en une seule langue (anglais, généralement). La propriété Wikidata depicts (P180), cependant, peut être décrite en plusieurs langues. L'ajout de descriptions aux fichiers multimédias transforme donc Wikimedia Commons en une plate-forme véritablement multilingue, où les lecteurs de n'importe quelle langue peuvent ou pourront trouver, comprendre et utiliser des fichiers multimédias bien plus facilement.

Recherche, accessibilité et réutilisation de fichiers

Les descriptions déclarées dans Wikidata sont utilisées par MediaSearch pour aider les utilisateurs de Commons (et d'autres Wiki) à trouver les résultats les plus pertinents.

Dans un premier temps, MediaSearch exécute des requêtes qui incluent des déclarations et des légendes utilisant des données structurées. Ensuite, il développe et recherche des termes basés sur des Étiquettes Wikidata (le nom le plus courant sous lequel un élément Wikidata serait connu). Enfin, il peut encore se développer en fonction des catégories de Commons et des informations textuelles. Cela signifie qu'en plus de la correspondance de texte intégral, MediaSearch inclut des résultats qui ont un descripteur déclaré correspondant dans toute entité Wikidata aux mots-clé soumis par l'utilisateur. De même, il inclut les résultats qui ont une instruction digital representation of (P6243) pertinente.

By taking advantage of statements like depicts, MediaSearch works in any language supported by MediaWiki and does not require knowledge of English. MediaSearch also powers the visual editor on Wikipedia, allowing more image results, in more languages, to show up to illustrate Wikipedia articles.

En outre, les descriptions sont utilisées par des outils (en développement) de suggestion d'images, outils destinés à aider les utilisateurs à trouver des images pertinentes pour des articles Wikipédia non illustrés (en savoir plus sur les suggestions d'images ici.

Meilleures pratiques recommandées

Depicts level of detail

Recommandations générales

The primary purpose of depicts (P180) statements on Commons is to identify, in a structured way, the items clearly visible in a media file.

Wikidata has entities at varying levels of detail and along different ontological dimensions. MediaSearch cannot always reliably infer relationships between them. Therefore, to optimize a media file for discovery, multiple depicts (P180) statements should be added, both general and specific, taking into account different ontological dimensions.

The Rough Collie who played Lassie in 1942

For example, this image of the fictional dog Lassie should have the statements dog (Q144) (class of organisms), Rough Collie (Q38650) (dog breed), Lassie (Q941640) (fictional character), and Pal (Q7126106) (the individual dog depicted).

Black Mountain Grove, a giant sequoia grove

Another example is this image of a Sequoia tree, which should have both Sequoia (Q1975652) (a taxon) and tree (Q10884) (a woody plant) depicts statements. Even though, in everyday speech, the term "Sequoia" may often refer to a "Sequoia tree" (as opposed to Sequoia seeds or Sequoia wood, etc.), in the Wikidata ontology Sequoia is considered a subclass of taxon (Q16521). For that reason, the tree (Q10884) should be added to allow for more precise searches.

As a consequence, it is recommended to add multiple depicts statements, both general and specific, taking into account different ontological dimensions. Note, however, that redundant tagging along the same ontological dimension should be avoided wherever possible. For example, if an image shows a dog, there is no need to add the entire taxon tree of Canis familiaris (Q20717272): Canis (Q149892) , Canidae (Q25324), Caniformia (Q27414), Carnivora (Q25306), etc. However, in practice, it may well happen that one user applies a more general depicts statement, and another user comes along at a later point in time and is able to apply a more specific one. In this case, the more specific depicts statement should always be added. If the two statements are undisputably on the same ontological dimension (like for example body of water (Q15324) and lake (Q23397)), the less specific statement can be removed. If in doubt, it is preferable to keep both statements. There is no need for the community to try to root out all redundant statements. The tools making use of the data are able to take care of this.

If there are multiple items clearly and deliberately depicted in the media file, all should be added as separate depicts statements, within reason. The most significant ones should be marked as "prominent" (see example below). For files that depict dozens or hundreds of items (e.g., movies) only those items which are most prominent should be listed.

Bonny and Clyde

If groups of the multiple depicted items are a common grouping, and have a grouped item on Wikidata, the grouped item should also be added as a depicts statement. For example File:Bonnieclyde_f.jpg should have the statement depicts: Bonnie and Clyde (Q219937) as well as depicts: Bonnie Parker (Q2319886) and depicts: Clyde Barrow (Q3320282).

What items not to add

Parts of a bigger item: The depiction of a face (Q37017) usually implies the presence of a nose (Q7363), nostril (Q858590), and nasal hair (Q1899093). It is not necessary to list them all on every portrait. Instead just state that the portrait depicts the person in the portrait. Anatomical or other compositional relationships can already be modelled within Wikidata.

Abstract concepts and value judgments: Depicts statements should include what is visible in the image. The photo of the sequoia tree may be beautiful, and trees may be related to the abstract idea of nature, but do not add beauty (Q7242) or nature (Q7860). Lassie is known as a smart dog, but the photo does not depict intelligence (Q83500).

Items expected to be covered by other statements: Many media include incidental items, actions, locations, context, formatting choices, or background, that are not the primary items depicted. As structured data on Commons expands, we expect to have additional properties enabled where these extra items can be specified. In the meantime, it is best to refrain from specifying these as depicts, unless they are central to the purpose of the media.

For example, some expected properties include:

• location
• depicted in background
• clothing
• format (e.g. monochrome photography, daguerreotype, oil painting, portrait)
• season/date/time
• photographer or artist
• genre (e.g. modern art)

Comparison to Categories

It is important to understand that Structured Data on Commons does not function like the Commons category system. Most notably, it tends to avoid creating specific items for intersections of concepts that are on different ontological dimensions. Thus, while Commons has a category Sequoia sempervirens (foliage), depicts statements would refer to two different Wikidata items: Sequoia sempervirens (Q150129) (the taxon), and foliage (Q18250160) (part of a plant). To what extent the two should be connected by a qualifier to allow for more precise statements is still up for discussion.

As the structured data in search and the functionality of the search engine are still very incomplete and not even near the usability of the category system, it is recommended to continue to apply categories to images. The general rule for categories is to always place an image in the most specific categories, and not in the levels above those. See:

Commons:Categories#Over-categorization.

Mark depicted items as prominent

In a depicts (P180) statement, it is possible to identify the main features of an image using the ‘mark as prominent’ option. This is particularly important if many depicts statements have been added to a file.

Multiple depicts statements make it hard to know which statements are the most important or relevant ones in a file. Statements essentially only have two states: something is in the file, or it is not. There is no further detail about just how relevant something is in that file.

To choose which depicts statement to 'mark as prominent', you should ask yourself:

Are the depicts statements equally important, or is one of them the obvious subject and the other a less relevant background detail? If so, which one is more prominent?
Is a depicts statement on one file more prominent than the same depicts statement on another?

Sessão do Conselho de Estado (Q43485263), a Brazilian painting by Georgina de Albuquerque (Q2855284)

The Sessão do Conselho de Estado (Q43485263) painting is a good example of the use of ‘mark as prominent’. There are several characters depicted in the work, most of them on the same disposition, but the main subject and focus is the female character, Maria Leopoldina of Austria (Q84239), who is also represented in a different color.

As a feature, ‘mark as prominent’ enhances the accessibility of media files for people with visual disabilities, as it is a structured way to differentiate between elements displayed in an image, especially considering that not all media files on Wikimedia Commons have a Wikidata item (or are notable enough to have one) to be described in a structured and multilingual way on that platform. When querying the structured data, 'prominent' statements can be found by searching for statements with rank "preferred".

Make sure you have selected the right Wikidata item

Banana and cross section

Wikidata is a very large database and includes many items with identical names. These items should have descriptions to guide you to the correct choice. For example, when adding a depicts statement for this photo of a banana, you may be tempted to enter "bananas". The first search result is not banana (Q503) but Bananas (Q806092), the 1971 film by Woody Allen. Wikidata items are typically singular, and typically case sensitive such that if you are looking for a fruit but the item is capitalized, it is likely incorrect. If you are unsure, just click on the item to make sure it is what you are looking for.

Good practices and advanced modelling examples

Several good practices and examples may be found on the Modeling Depiction page, in particular for the specific case of Works of Art.

== Notes==