Rozšíření:CommonsMetadata

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This page is a translated version of the page Extension:CommonsMetadata and the translation is 5% complete.
Základní informace k tomuto rozšíření MediaWiki
OOjs UI icon advanced-invert.svg
CommonsMetadata
Stav rozšíření: stabilní
Zavádění API
Popis Pokusy o extrahování metadat ze stránek Commons
Napsal(i) Brian Wolff (bawolffdiskuse)
Zásady kompatibility Vydání snímků následuje MediaWiki. Hlavní vývojová větev není zpětně kompatibilní.
MediaWiki 1.25+
PHP 5.4+
Změny v databázi nedělá
Licence GNU General Public License 2.0 nebo pozdější
Zdrojový kód
  • $wgCommonsMetadataForceRecalculate
  • $wgCommonsMetadataPublicDomainPageUrl
  • $wgCommonsMetadataSetTrackingCategories
Přeložte rozšíření CommonsMetadata, používá-li lokalizaci z translatewiki.net
Problémy Otevřené úkoly · Nahlásit chybu

Rozšíření CommonsMetadata je pokusem o extrahování metadat ze stránek Wikimedia Commons, ale je také dostupné ve všech ostatních projektech Wikimedie. It adds some extra information to the imageinfo API, based on templates and categories in the image description. It is used by a number of extensions / tools (such as Extension:MultimediaViewer , Extension:VisualEditor , Extension:MobileFrontend , Mobile-Content-Service (MCS)) to provide better lightboxes or image selection dialogs.

The extension in its current form is intended to be a temporary solution, eventually replaced by Wikidata on Commons.

Motivation & design choices

The assumptions of this extension are the following.

  • At some point in the future, wikidata will take over handling metadata at commons. In order to avoid disruptive changes, which will soon need to be changed again, the extension should work with commons metadata as it currently is (so not introducing new parser functions). Hence screen scraping.
  • The content of many of the fields on a commons description page include rich formatting (In particular: Links, italics, bold. In some cases more complex things like embedded images)
    • As a result, extension outputs parsed html (wikitext sucks, plain text doesn't capture the data)
    • Futhermore, 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", its hard to convert that to a precise date (otoh, many examples can be).
    • To carry that forward, also apply formatting to exif metadata, which is controlled on 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-inspecific as possible, with the commons and non-commons part separated.
  • Commons description pages have multilingual descriptions. Lots of users probably just want one language.
    • In this implementation, it 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 seperator on numbers)

Installation


  • Stáhněte soubor/y a vložte je do adresáře pojmenovaného CommonsMetadata ve vaší složce extensions/.
  • Následující kód přidejte na konec vašeho souboru LocalSettings.php :
    wfLoadExtension( 'CommonsMetadata' );
    
  • Yes Dokončené – Přejděte na stránku Special:Version vaší wiki a zkontrolujte, zda bylo rozšíření úspěšně nainstalováno.

Pro ty, kteří používají MediaWiki 1.24 a starší:

Výše uvedené instrukce se týkají instalace přes wfLoadExtension(), což je novější způsob instalace rozšíření. Pokud potřebujete toto rozšíření nainstalovat na starší verzi (MediaWiki 1.24 či starší), musíte místo wfLoadExtension( 'CommonsMetadata' ); použít:

require_once "$IP/extensions/CommonsMetadata/CommonsMetadata.php";

Testing

Varování Varování: 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 that has only wikitext/HTML and put in the various parameter references (or don't) manually. 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).

Usage

Use the imageinfo API, and include extmetadata as an image info property specified via iiprop.

Example usage:

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

View this example in the API sandbox:

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):

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

See also