Erweiterung:CommonsMetadata
CommonsMetadata Freigabestatus: stabil |
|
---|---|
Einbindung | API |
Beschreibung | Versucht, Metadaten von Commons-Seiten zu extrahieren |
Autor(en) | Brian Wolff (bawolffDiskussion) |
Kompatibilitätspolitik | Snapshots werden zusammen mit MediaWiki veröffentlicht. Der Master ist nicht abwärtskompatibel. |
MediaWiki | 1.25+ |
PHP | 5.4+ |
Datenbankänderungen | Nein |
Lizenz | GNU General Public License 2.0 oder neuer |
Herunterladen | |
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|
Quarterly downloads | 65 (Ranked 75th) |
Public wikis using | 1,055 (Ranked 247th) |
Übersetze die CommonsMetadata-Erweiterung, wenn sie auf translatewiki.net verfügbar ist | |
Probleme | Offene Aufgaben · Einen Fehler melden |
The CommonsMetadata extension is an attempt at extracting metadata from Wikimedia Commons pages but is also available at all other Wikimedia projects. 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 Erweiterung:MultimediaViewer , Extension:VisualEditor , Erweiterung: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.
Installation
- Die Erweiterung herunterladen und die Datei(en) in ein Verzeichnis namens
CommonsMetadata
im Ordnerextensions/
ablegen.
Entwickler und Code-Beitragende sollten stattdessen die Erweiterung von Git installieren, mit:cd extensions/
git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/CommonsMetadata - Folgenden Code am Ende deiner LocalSettings.php -Datei einfügen:
wfLoadExtension( 'CommonsMetadata' );
- Erledigt – Navigiere zu Special:Version in deinem Wiki, um zu überprüfen, ob die Erweiterung erfolgreich installiert wurde.
Motivation & design choices
Siehe mailarchive:wikitech-l/2013-August/071593.html
The assumptions of this extension are the following.
- At some point in the future, Wikidata will take over handling metadata at Commons. To avoid disruptive changes, which will soon need to be changed again, the extension should work with common 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 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:
|
$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. |
Tests
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).
Verwendung
Use the imageinfo API, and include extmetadata
as an image info property specified via iiprop
.
Example
View this example in the API sandbox:
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
orFalse
(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).
Siehe auch
- Manual:File metadata handling
- Erweiterung:MultimediaViewer - currently the main user of the information provided by CommonsMetadata.
- Request for comment on handling image information
- Template detection on local wikis with locally uploaded files – Describes how to prepare the templates for fetching metadata and thus displaying them when using the MultimediaViewer extension.
Diese Erweiterung wird in einem oder mehreren Wikis von Wikimedia verwendet. Das bedeutet mit hoher Wahrscheinlichkeit, dass die Erweiterung stabil ist und gut genug funktioniert, um auf solch häufig besuchten Webseiten benutzt zu werden. Suche nach dem Erweiterungs-Namen in den Wikimedia CommonSettings.php und den InitialiseSettings.php-Konfigurations-Dateien, um nachzusehen, wo es installiert ist. Eine vollständige Liste der installierten Erweiterungen in einem bestimmten Wiki wird auf Special:Version im Wiki generiert und angezeigt. |
Diese Erweiterung ist in den folgenden Softwarepaketen enthalten und/oder wird von den folgenden Wiki-Farmen, bzw. Wiki-Hostern verwendet: Dies ist keine maßgebliche Liste. Softwarepakete und/oder Wiki-Farmen, bzw. Wiki-Hoster nutzen diese Erweiterung ggf., obwohl sie nicht in dieser Liste enthalten sind. Prüfe daher stets die Nutzung im verwendeten Softwarepaket und/oder bei der Wiki-Farm, bzw. dem Wiki-Hoster. |