Extensión:WikibaseMediaInfo

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MediaWiki extensions manual
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WikibaseMediaInfo
Release status: beta
MediaInfo Entity Page.png
Descripción Extensión de Wikibase para manejar metadatos estructurados de archivos multimedia
Autor(es) El equipo de Wikidata
Última versión actualizaciones continuas
MediaWiki master
PHP 5.5.9+
Cambios de la base de datos
Licencia GNU General Public License 2.0 or later
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WikibaseMediaInfo es una extensión para Wikibase que añade un tipo de entidad de MediaInfo para manejar datos estructurados para archivos multimedia.

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.

Requirements

Instalación

  • Ensure CirrusSearch and Wikibase (client and repo) are set up properly.
  • Descarga y extrae los archivos en el directorio «WikibaseMediaInfo» dentro del directorio extensions/ existente.
  • Ejecuta Composer para instalar las dependencias de PHP usando composer install --no-dev en el directorio de la extensión. (ver T173141 para complicaciones potenciales)
  • Añade el siguiente código a tu LocalSettings.php (preferiblemente al final):
    wfLoadExtension( 'WikibaseMediaInfo' );
    
  • Ejecuta el script de actualización, que creará automáticamente las tablas que necesita esta extensión en la base de datos.
  • Yes Listo – Navega a Special:Version en tu wiki para verificar que la apariencia se haya instalado correctamente.
  • Add required configuration.

Configuration

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:

Required Config (must be added to LocalSettings)

  • $wgMediaInfoEnableFilePageDepicts (temporary feature flag) Enables MediaInfo the depicts widget on the File Page when set to true.
  • $wgMediaInfoProperties Establishes the main linked property used to build the MediaInfo entity in Wikibase. Value is an array of key-value pairs connecting a label name to an existing wikibase database id.
   ['depicts': 'P1]
  • $wgDepictsQualifierProperties Establishes the descriptors or qualifiers of the MediaInfo entity defined in $wgMediaInfoProperties. Value is an array of key-value pairs connecting a label name to an existing wikibase database id.
   ['features' =>  'P2',     
     'color' =>  'P3',    
     'wears' =>  'P4',    
     'part' =>  'P5',    
     'inscription' =>  'P6',    
     'symbolizes' =>  'P7',     
     'position' =>  'P8',     
     'quantity' =>  'P9',];


Other Config:

  • $wgUploadWizardConfig['wikibase']['enabled'] Enables MediaInfo data on UploadWizard when set to true.
  • $wgMediaInfoEnable Defaults to true.
  • $wgMediaInfoShowQualifiers (temporary feature flag) . Defaults to true.

MediaInfo Glossary

Property (P-item)

A property is used to categorize or describe a file. It has a unique id in wikibase in the form Pxxx such as P123. Examples of file properties are ‘depicts’ (what an image is a picture of), ‘resolution’, ‘created by’, ‘license’.

Item (Q-item)

An item is the concept, topic, or object. It is represented by a unique id in the form Qxxx. For example on Wikidata the planet Earth is the item Q2 and the CC0 licence is Q6938433.

Claim

A single fact about a media file consisting of a key-value pair (usually a property-item) such as Licence=CC-By-SA or Depicts=Dog. Claims are stored simply as strings, using the property ids and item ids as appropriate. For example, an image depicting a black cat could have the claim depicts=cat(color=black).

Caption

A short piece of text describing a media file, plus its language. This is used to WikibaseMediaInfo to provide a short description of the file (the same as ‘labels’ in wikibase).

MediaInfo Entity (M-item)

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
  • any number of captions
  • any number of claims

(Note: if there is no caption or claim data then the entity is not stored in the database - in this case the entity is known as a ‘virtual entity’)

Qualifier

A qualifier is a secondary claim that modifies the primary claim. 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)’.

MediaInfo UI

MediaInfo entities are shown on, and can be edited from, their associated File page. Captions and claims are shown separately, and claims are split into ‘depicts’ claims and ‘other’ claims.

Search

Search by caption

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

Search implementation

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 value is an item) - e.g. ‘depicts house cat’ is stored as P1=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 P1=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 P1=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, eg. ‘depicts human, quantity 1’ is stored as P1=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 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']) ORits 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']).

Tests

PHPUnit tests are located 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 by run using MediaWiki core’s phpunit.php endpoint.

Véase también