how to represent images

[VladimirAlexiev]

@jimkont @chile12 @Termilion
dbpedia/extraction-framework#515 will extract more images from pages.

So we need to pick props for different kinds of images

• currently foaf:depiction is used for the main image but this is wrong: "A depiction of some thing" is any sort of image, not necessarily the main image
  • need new prop for the main image
  • Schema also doesn't have such, http://schema.org/primaryImageOfPage is only applicable to web pages (but Berlin is a city not a page), see discussion in preferredness, notability, or importance schemaorg/schemaorg#1726
• need dbo: props for the "special images" map, coat of arms, flag, signature
• currently dbo:thumbnail is used for a reduced-size main image
  • but what if I want a thumbnail of some of the other images?
  • foaf:thumbnail "A derived thumbnail image" is Image->Image and that's the better idea.
  • (http://mappings.dbpedia.org/index.php/OntologyProperty:Foaf:thumbnail commits criminal namespace hijacking, this should be fixed).

Referring to examples in dbpedia/extraction-framework#515 we could go something like this:

dbr:Berlin
  # no main image
  dbo:coatOfArms wiki-commons:Special:FilePath/Coat_of_arms_of_Berlin.svg;
  dbo:flag wiki-commons:Special:FilePath/Flag_of_Berlin.svg;
  dbo:map wiki-commons:Special:FilePath/Deutschland_Lage_Berlins.svg;
  foaf:depiction ... # all the rest.

dbr:Barack_Obama
  dbo:image wiki-commons:Special:FilePath/President_Barack_Obama.jpg;
  # or maybe better dbo:mainImage
  dbo:signature wiki-commons:Special:FilePath/Barack_Obama_signature.svg;

### Dont need this since it is systematically derived, and how do you know 300 is best for me?

wiki-commons:Special:FilePath/Coat_of_arms_of_Berlin.svg a dbo:Image;
  dbo:thumbnail wiki-commons:Special:FilePath/Coat_of_arms_of_Berlin.svg?width=300.

wiki-commons:Special:FilePath/Flag_of_Berlin.svg;
  a dbo:Image;
  dbo:thumbnail wiki-commons:Special:FilePath/Flag_of_Berlin.svg?width=300.

Notes

1. This example uses CURIEs that are not valid in turtle/sparql (too lazy)
2. Haven't checked what dbo: props already exist re the above

[chile12]

Dear Vladimir, probably a good idea to talk about this at the meeting.
I would suggest you to broach the subject there?

I don't see anything wrong with having multiple foaf:depiction, since its not functional.
But this without having thought about this very deeply.

Would be nice to have this before I start with the main extraction next month.

Also, I'd suggest a new property like: dbo:pageRankValue = http://purl.org/voc/vrank#hasRank ° http://purl.org/voc/vrank#rankValue (http://www.aifb.kit.edu/images/4/4d/Dbrank2012.pdf)
This will enable us to create page-rank datasets in NT format with just one triple per resource.
Atm it looks like this:
http://dbpedia.org/resource/!!!_(Chk_Chk_Chk) http://purl.org/voc/vrank#hasRank [http://purl.org/voc/vrank#rankValue "0.15"^^http://www.w3.org/2001/XMLSchema#float] .

[VladimirAlexiev]

Unfortunately I won't be at the meeting (euBusinessGraph meeting at the same time).
I agree to have multiple foaf:depiction and emit the main image as dbo:image (Wikidata's image property is usually single)