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Estensione:CommonsMetadata

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Manuale sulle Estensioni MediaWiki
CommonsMetadata
Stato della release: stabile
Implementazione API
Descrizione Prova ad estrarre metadati dalle pagine commons
Autore(i) Brian Wolff (bawolffdiscussione)
Politica di compatibilità Snapshots releases along with MediaWiki. Master is not backward compatible.
MediaWiki 1.25+
PHP 5.4+
Modifiche al Database No
Licenza GNU General Public License 2.0 or later
Scaricare
Download extension
Git [?]:
Parametri
  • $wgCommonsMetadataForceRecalculate
  • $wgCommonsMetadataPublicDomainPageUrl
  • $wgCommonsMetadataSetTrackingCategories
Hook usati
Quarterly downloads 74 (Ranked 70th)
Public wikis using 1,055 (Ranked 247th)
Traduci l'estensione CommonsMetadata se è disponibile su translatewiki.net
Problemi Compiti aperti · Riportare un bug

L'estensione CommonsMetadata è un tentativo di estrarre metadati dalle pagine di Wikimedia Commons. Aggiunge alcune informazioni extra all'API imageinfo, basate su template e categorie presenti nella descrizione dell'immagine. It adds some extra information to the imageinfo API, based on templates and categories in the image description. It is used by several extensions/tools (such as Estensione:MultimediaViewer , Extension:VisualEditor , Extension:MobileFrontend , Mobile-Content-Service (MCS)) to provide better lightboxes or image selection dialogs.

L'estensione nella sua forma attuale è intesa come soluzione temporanea, da sostituirsi con Wikidata su Commons.

Installazione

  • Download and move the extracted CommonsMetadata folder to your extensions/ directory.
    Developers and code contributors should install the extension from Git instead, using:cd extensions/
    git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/CommonsMetadata
  • Aggiungi il seguente codice al tuo $LocalSettings (preferibilmente alla fine): 
    wfLoadExtension( 'CommonsMetadata' );
  •   Done – Naviga in Special:Version nella tua wiki per verificare che l'estensione sia stata installata correttamente.

Motivazioni e scelte progettuali

See mailarchive:wikitech-l/2013-August/071593.html

Le assunzioni fatte per questa estensione sono le seguenti.

  • Ad un certo punto in futuro, wikidata prenderà in mano la gestione dei metadati su commons. Per evitare cambiamenti troppo marcati, che verrebbero subito modificati nuovamente, l'estensione dovrebbe lavorare con i metadati di commons, come avviene attualmente (senza introdurre nuove funzioni di analisi). Da qui lo screen scraping.
  • The content of many of the fields on a commons description page includes rich formatting (In particular: Links, italics, bold. In some cases, more complex things like embedded images)
    • As a result, the extension outputs parsed html (wikitext sucks, plain text doesn't capture the data)
    • Furthermore, the data tends to be formatted for human display rather than (for example) machine-formatted dates. When the date field says something like "circa 1600s", it's hard to convert that to a precise date (many examples can be).
    • To carry that forward, also apply formatting to EXIF metadata, which is controlled on the wiki (For example, commons links the camera name to a Wikipedia article)
  • If we can't extract info from the description page, but the file has the author tagged in EXIF/XMP/iptc metadata, we should use that as a fallback.
  • Ideally, such a system would be as commons-specific as possible, with the commons and non-commons parts separated.
  • Commons description pages have multilingual descriptions. Lots of users probably want one language.
    • This implementation applies per language conventions to dates and things. Additionally, for explicitly multi-lingual fields (description), there is an option to return all or just a single language. Even in single language mode, some things are still language-specific (like the thousands separator on numbers)

Configuration

parameter default description
$wgCommonsMetadataSetTrackingCategories false Add the following tracking categories to file pages when the corresponding information is not provided either via templates on the file page of (for some of these) EXIF metadata:
  • Files with no machine-readable license (commonsmetadata-trackingcategory-no-license)
  • Files with no machine-readable description (commonsmetadata-trackingcategory-no-description)
  • Files with no machine-readable author (commonsmetadata-trackingcategory-no-author)
  • Files with no machine-readable source (commonsmetadata-trackingcategory-no-source)
  • Files with no machine-readable patent (commonsmetadata-trackingcategory-no-patent) (for 3D files)
$wgCommonsMetadataPublicDomainPageUrl https://commons.wikimedia.org/wiki/Help:Public_domain Link used for 'license' attribute in schema.org markup for files in the public domain.
$wgCommonsMetadataForceRecalculate false Force calculation of metadata even when the image is from a foreign repository that would provide it. This is meant for local development.

Testing

  Attenzione: If you're developing or testing this extension, we do NOT suggest you copy the Commons templates for image metadata, as they take extremely long to compile and have complicated dependencies like Scribunto. Instead, get an expanded version with only wikitext/HTML and manually put in the various parameter references (or don't). You can find an example (to be used with "Special:Import") here. Or use Vagrant which includes certain templates by default.

When testing with remote images (e.g. Commons images if you have enabled $wgUseInstantCommons ), you can set $wgCommonsMetadataForceRecalculate = true; to force CommonsMetadata to parse the description page of the image and extract the metadata (normally, if the remote repository had CommonsMetadata installed as well, it would just copy the API output from there).

Uso

Usa l'API imageinfo ed inserisci extmetadata come proprietà dell'informazione dell'immagine specificata attraverso il parametro iiprop.

Esempio di utilizzo:

https://commons.wikimedia.org/w/api.php?action=query&prop=imageinfo&format=xml&iiprop=extmetadata&iilimit=10&titles=File%3ACommon%20Kingfisher%20Alcedo%20atthis.jpg
https://commons.wikimedia.org/w/api.php?action=query&prop=imageinfo&format=json&iiprop=extmetadata&iilimit=10&titles=File%3ACommon%20Kingfisher%20Alcedo%20atthis.jpg

Visualizza questo esempio nella API sandbox:

https://www.mediawiki.org/wiki/Special:ApiSandbox#action=query&prop=imageinfo&format=xml&iiprop=extmetadata&iilimit=10&titles=File%3ACommon%20Kingfisher%20Alcedo%20atthis.jpg
https://www.mediawiki.org/wiki/Special:ApiSandbox#action=query&prop=imageinfo&format=json&iiprop=extmetadata&iilimit=10&titles=File%3ACommon%20Kingfisher%20Alcedo%20atthis.jpg

Returned data

The extension currently provides the following items in the extmetadata field of the response (the field names were chosen, where possible, to follow the IPTC-IIM format used in EXIF headers):

Data based on machine-readable data in the Information template:

  • ImageDescription - image description
  • Artist - author name (might contain complex HTML, multiple authors, etc)
  • Credit - source
  • DateTimeOriginal - time of creation (space-separated ISO 8601 timestamp whenever possible, but can be any other textual description of a date, possibly with HTML mixed in)
  • ObjectName - title (for a book/painting; otherwise just the file name)
  • Permission - contents of the Permission field of the template. It can be a lot of things (license template, OTRS ID, details on how to attribute...)
  • AuthorCount - the number of templates with authors (e.g., Book, Photograph...). The number of actual authors might be higher if a template describes multiple authors in a single string.

Data based on machine-readable data in the Location template:

  • GPSLatitude - latitude
  • GPSLongitude - longitude
  • GPSMapDatum - coordinate type (only WGS-84 supported for now)

Data based on machine-readable data in the license template:

  • LicenseShortName - short human-readable license name
  • LicenseUrl
  • UsageTerms
  • Copyrighted - True or False (for public domain images)

For multi-licensed images, these values are currently unreliable.

  • Attribution - custom attribution that should replace Artist + Credit (can also originate from the Information template)
  • AttributionRequired - booleanish (phab:T86726), tells whether there is a legal requirement to attribute
  • NonFree - booleanish, true means the image is not under a free license. (Used for non-Commons images only.)

Other data:

  • CommonsMedadataExtension - contains the metadata parser version number; mostly for internal use
  • License - a best guess at the license of the image (mostly for internal use by MediaViewer, might change; LicenseShortName is probably more reliable)
  • Categories - a |-separated list of the categories of the image.

Based on parsing category names, probably won't work for images not hosted on Commons.

  • Restrictions - reuse restrictions such as trademarks or personality rights; an array of keywords (the class names from this table, without the restriction- prefix). See also the restrict-* icons in MediaViewer.
  • DeletionReason - if set, the template is being considered for deletion.

(Based on the nuke template, probably not reliable outside Commons.) It contains a deletion reason, but it is phrased to be applicable for a log entry, so it might be misleading (e.g. past tense when actually it is not yet decided whether the image will be deleted).

Vedi anche

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