This document discusses improvements made to extract metadata from Wikimedia Commons pages for inclusion in DBpedia. It describes new extractors developed to handle file metadata, image galleries, image annotations, KML data, and licensing information. Challenges remaining include handling nested templates and improving annotation descriptions. The work aims to make a vast amount of Commons data available as structured linked data through DBpedia.

1. DBpedia ♥ Commons
Gaurav Vaidya - Dimitris Kontokostas - Andrea Di Menna - Jim O'Regan
2nd DBpedia Meeting Leipzig 03.09.2014

2. ~23M pages like this
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3. ~23M pages like this
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4. A lot of pages like this
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5. Many pages like this
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6. Not very similar to pages like this
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7. DBpedia Extraction Framework
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✔ “Wiki agnostic”
✔ Pluggable
extractors
✔ Out of the box
support for
common
metadata
✗ Tuned for extraction in the main namespace (not File:)
✗ Many other challenges left

8. 2nd DBpedia Meeting Leipzig 03.09.2014
Challenges
✔ File metadata
✔ KML files
✔ Image Galleries
✔ Image Annotations
✔ Mappings Wiki
✔ Bootstrap community mappings
✔ Template Statistics
✔ Licensing
✔ Technical details I'll not go into

9. Out-of-the-box support
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● Categories (skos)
● External links
● Geo-coordinates
● Raw infobox properties
● Labels
● PageIds / Revisions
● Links (internal / external)
● Mappings Wiki (with some tweaking / more on that later)

10. 2nd DBpedia Meeting Leipzig 03.09.2014
File metadata
● New Extractor
● New file Class hierarchy
– dbo:File, dbo:Image, dbo:StillImage, dbo:MovingImage and
dbo:Sound
Sample Output:
:Aeropetes.JPG a dbo:StillImage, dbo:Image, dbo:Document, dbo:File, Work;
dcterms:type dbo:StillImage
dbo:fileExtension "jpg"
dcterms:format "image/jpeg"
dbo:fileURL commons-path:Aeropetes.JPG ;
foaf:depiction commons-path:Aeropetes.JPG ;
dbo:thumbnail commons-path:Aeropetes.JPG?width=300 .

11. 2nd DBpedia Meeting Leipzig 03.09.2014
Image Galleries
● Attach each gallery
item to the page
resource
:Colorado dbo:hasGalleryItem
Colorado.JPG,
Denver_Colorado_Art.jpg,
ColoradoCenter1.jpg.

12. Image Annotations
2nd DBpedia Meeting Leipzig 03.09.2014
● Annotation
Gadget
● Boxes with
optional
description

13. Image Annotations
● W3 Media Fragments recommendation
● Embed the box in the URI
– ?width=15130&height=1886#xywh=pixel:10431,324,1670,1208> .
● Add descriptions in the new resource
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14. 2nd DBpedia Meeting Leipzig 03.09.2014
Mappings Wiki

15. Template Statistics
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16. 2nd DBpedia Meeting Leipzig 03.09.2014
Licensing
● Identified & imported automatically ~360 licence templates
● Use the mappings wiki
● Needed some hacking to make it work
– e.g. {{Self|GFDL|cc-by-sa-3.0,2.5,2.0,1.0}}
:Acraea_circeis.JPG dbo:license
<http://creativecommons.org/publicdomain/mark/1.0/>
:Antepipona_deflenda_-_2012-10-17.webm dbo:license <
http://creativecommons.org/licenses/by-sa/3.0/ >

17. KML Annotations attached to media
Attach raw KML data to resource with custom extractor
Sample Output:
:Yellowstone_1871b.jpg dbo:hasKMLData “””
?xml version=1.0 encoding=UTF-8?>
<kml xmlns=http://earth.google.com/kml/2.2”>
<GroundOverlay>
<name>Yorktown, Indiana (1878)</name>
<description>An 1878 map of Yorktown in Tippecanoe County, Indiana. Source: Kingman
Brothers&apos; Combination Atlas Map of Tippecanoe County, Indiana, 1878.</description>
<color>99ffffff</color><Icon><href>BIG_LINK_HERE</href>
<viewBoundScale>0.75</viewBoundScale></Icon>
<LatLonBox>
<north>40.26126145890567</north><south>40.25777915632657</south>
<east>-86.77033439383223</east><west>-86.77398493316619</west>
<rotation>-1.123009884936565</rotation></LatLonBox>
</GroundOverlay></kml>“”"^^rdfs:XMLLiteral .
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18. 2nd DBpedia Meeting Leipzig 03.09.2014
Left TODOs
● Nested templates are commonly used and cannot be handled
by the mappings wiki atm
– e.g. Media descriptions (although mapped) are missing
{{Information |Description= {{en|Logo of the [[w:en:DBpedia|DBpedia project]]}} {{fr|
Logo du projet [[w:fr:DBpedia|DBpedia]]}}
● Annotation descriptions need some tweaking
– Need to render wikitext
● Put it under a SPARQL Endpoint
● Provide Linked Data
– http://commons.dbpedia.org

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Thank You!
Special thanks to:
● Alexandru Todor (importing the License templates)
● Google Summer of Code for sponsoring this project
(Gaurav Vaidya)
Questions?
Dataset: http://nl.dbpedia.org/downloads/commonswiki
Dataset samples: https://github.com/gaurav/commons-extraction