扩展:WikibaseMediaInfo

MediaWiki扩展手册

WikibaseMediaInfo 发行状态： 稳定版
描述	Wikibase extension to manage structured metadata of media files
作者	Structured Data team
最新版本	持续更新
MediaWiki	master
数据库更改	是
许可协议	GNU通用公眾授權條款2.0或更新版本
下載	下載扩展 Git [?]: 下载Git master 浏览存储库 (Phabricator · GitHub) 提交历史 存储库貢獻者 (GitHub) 代码复核 readme
参数 $wgMediaInfoMediaSearchProfiles $wgMediaInfoSupportedDataTypes $wgMediaInfoProperties $wgMediaInfoExternalEntitySearchBaseUri $wgMediaInfoCustomMatchFeature $wgMediaInfoHelpUrls $wgMediaInfoMediaSearchTitleMatchBaseUri
添加权限 mediainfo-term
使用的函数钩 ArticleUndelete BeforePageDisplay CirrusSearchAddQueryFeatures CirrusSearchProfileService CirrusSearchRegisterFullTextQueryClassifiers GetEntityByLinkedTitleLookup GetEntityContentModelForTitle GetPreferences MediaWikiServices MultiContentSave ParserOutputPostCacheTransform RevisionUndeleted ScribuntoExternalLibraries SearchDataForIndex2 SidebarBeforeOutput WikibaseClientEntityTypes WikibaseRepoEntityNamespaces WikibaseRepoEntityTypes
季度下載量	7 (Ranked 126th)
翻译WikibaseMediaInfo扩展
問題	开启的任务 · 报告错误

WikibaseMediaInfo is an extension to Wikibase adding a MediaInfo entity for handling structured data about multimedia files.

The extension hooks into the File Page. It stores supplemental metadata (captions and depicts statements) about the file in a MediaInfo Entity. The user can view, create, edit, and delete this data.

条件

• 通用语言选择器
• CirrusSearch
• Wikibase (Client and Repository)
• WikibaseCirrusSearch

安裝

• Ensure these extensions are installed and set up properly: CirrusSearch, Wikibase (Client and Repository), and WikibaseCirrusSearch.
• 下载文件，并将解压后的WikibaseMediaInfo文件夹移动到extensions/目录中。
  开发者和代码贡献人员应从Git安装扩展，输入：cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/WikibaseMediaInfo
• 只有從git安裝才运行Composer来安装PHP依赖，通过发行composer install --no-dev至扩展目录。 （参见工單T173141了解潜在问题。）
• 将下列代码放置在您的LocalSettings.php 的底部：

  wfLoadExtension( 'WikibaseMediaInfo' );
  

• 运行更新脚本，它将自动创建此扩展必须依赖的数据库表。
• Configure as reqiured.
•  完成 – 在您的wiki上导航至Special:Version，以验证已成功安装扩展。

媒体信息界面

MediaInfo entities are shown on, and can be edited from, their associated File page and while uploading a file via UploadWizard.

There are separate sections in the UI for editing captions and statements.

An editing interface is always shown for default properties (defaults are defined in config). On live Commons, depicts is the only default property — users are encouraged to describe what an image depicts. Statements with other properties can be added by the user at will.

詞彙

媒体信息实体

A Wikibase entity that contains structured data about media files. It is stored in a slot on a File page and consists of

• an ID in the form Mxxx, where xxx is the id of the associated wiki page
• 任意数量的标题（每种语言一个）
• 任意数量的声明

If there is no caption or statement data, then the entity is not stored in the database - in this case, it is known as a 'virtual entity'

标题

描述媒体文件的短语及其语言。 Used to provide a short description of the file (the same as 'labels' in Wikibase).

Statement

A single fact about a media file consisting of a key-value pair such as Licence=CC-BY-SA or Depicts=Dog.

Keys are always a property. Values can be any wikibase datatype.

Strictly, a wikibase 'statement' means a key-value pair (a 'claim') plus a rank (preferred, normal, or deprecated) and zero or more documentary references. We don't typically have documentary references for descriptions of files, and all statements have a normal rank by default, so in MediaInfo, we prefer to use the term 'statement' instead of 'claim'.

Property

A property is a file's property that can have a value - for example, 'depicts' (what an image is a picture of), 'resolution', 'created by', 'license'. Each property has a unique id in wikibase in the form Pxxx such as P123.

Item

An item is a concept, topic, or object with an ID - for example, on Wikidata, the CC0 license is Q6938433, physics is Q413 and the planet Earth is Q2. Each item has a unique id in wikibase in the form Qxxx such as Q123.

限定符

A qualifier is a secondary statement that modifies the primary statement. For example, an image might have a tree in the foreground and the sea in the background, in which case it could have 2 'depicts' claims associated with it - 'depicts=tree(applies to part=foreground)' and 'depicts=sea(applies to part=background)'.

搜索

以标题搜索

Users can search for files by their MediaInfo captions just as they would search for anything else. For example, if a user uploads a picture of the Eiffel Tower and enters 'Tour Eiffel' (French) and 'Eiffel Tower' (English) as multilingual file captions, the picture is findable by another user searching for either 'Eiffel Tower' or 'Tour Eiffel'.

Searching for claims/statements

Searching for claims/statements happens via WikibaseCirrusSearch keywords; for details, see:

Help:WikibaseCirrusSearch

搜索实现方法

When the File page is saved, the following MediaInfo data is written to the Elasticsearch index (all examples use Wikidata Property and Item IDs):

• Captions data in every language is stored in the opening_text field

• Claims are stored in the format propertyID=value as array elements in the statement_keywords field using the Wikibase property ID (and item ID, if the value is an item)

- , e.g., 'depicts house cat' is stored as P180=Q146

• Claims with qualifiers are stored in the statement_keywords field along with their qualifiers in the format propertyID=value[qualifierPropertyID=qualifierValue]. For example, the Mona Lisa painting (Wikidata item Q12418) depicts a sky (Q13217555) in the background (Wikidata property P518). If we arrange this data in a Wikibase claim, it would be: 'depicts sky, applies to part background', which would be stored as P180=Q12418[P518=Q13217555]

• Note that claims with qualifiers are also stored without the qualifier to increase their findability. So, for example, if someone entered the above claim-plus-qualifier, the claim P180=Q12418 is also stored, so that someone can find the file by searching for 'depicts sky' alone, as well as by searching for 'depicts sky, applies to part background'.

• Claims data with qualifiers where the qualifier value is a quantity is stored in the statement_quantity field in the format propertyID=value|quantity, e.g., 'depicts human, quantity 1' is stored as P180=Q5|1.

Note that not all claims are stored. A claim will be indexed in ElasticSearch only if ALL of the following conditions are true:

• The claim has a real value (i.e., its value is not 'no value' or 'unknown value') AND

• We know how to process its value for indexing. More value processors may be added in the future, but currently, we require the claim's value to be either a Q item ID, a string (alphanumeric), or a quantity (numeric) AND

• the claims's Wikidata property ID is NOT in a configurable list of excluded IDs ($wgWBRepoSettings[ 'searchIndexPropertiesExclude' ]) AND either its property ID is in a configurable list of property IDs that should be indexed ($wgWBRepoSettings[ 'searchIndexProperties' ]) OR its property type is in a configurable list of property types that should be indexed ($wgWBRepoSettings[ 'searchIndexTypes' ])

Note that for a claim's quantities to be stored, the claim must meet all the criteria above AND the property ID for the quantity qualifier must be present in a configurable list of property IDs ($wgWBRepoSettings[ 'searchIndexQualifierPropertiesForQuantity' ]).

MediaSearch search profile

Structured data (captions and statements) are now also included in the default search profile when searching (only) in the NS_FILE namespace. Search terms like "dog" will also include files where the caption (in the user's language) contains "dog", or contains a statement P180=Q144 (depicts=dog).

The Extension: WikibaseMediaInfo/MediaSearch subpage provides a more elaborate (technical) writeup of the MediaSearch search profile.

配置

Extension configuration variables are sets of key-value pairs. They are documented in more detail in WikibaseMediaInfo/extension.json. All config variables are added toLocalSettings.php.

The following config options are available for this extension:

Config (in LocalSettings.php)

• $wgMediaInfoProperties Default wikibase properties that will always be shown, allowing users to add/edit/delete values for them, on the File page/UploadWizard, regardless or not they already have a value. This is the depicts (P180) property on live Commons, as we want to encourage users to fill in values for this in particular. Value is an array of key-value pairs connecting a label name to an existing wikibase database ID.

   ['depicts' => 'P180']

• $wgMediaInfoHelpUrls URLs for pages where a user can learn more about particular wikibase properties - if there is a help URL for a particular property, then there will be a "learn more" link for that property that leads to the URL from the config.

   ['P180' => 'https://www.wikidata.org/wiki/Property:P180']

Other Config

• $wgUploadWizardConfig['wikibase']['enabled'] Enables MediaInfo data on UploadWizard when set to true.

开发

• 开发测试方法
• 數據模型
• Canonical JSON representation of MediaInfo items

测试

PHPUnit tests are in tests/phpunit. You can run tests not requiring the MediaWiki framework (located in tests/phpunit/composer) by running composer test. This command also runs code style checks using PHPCS.

Tests relying on the MediaWiki framework (located in tests/phpunit/mediawiki) must be run using MediaWiki core’s composer phpunit:entrypoint endpoint.

JavaScript 测试位于 tests/node-qunit。 You can run tests from a terminal with npm run test:unit. Node version 6.x should be used.

參見

• 维基共享资源上的结构化数据项目