Requests for comment/Image information
| Image information | |
|---|---|
| Component | General |
| Creation date | |
| Author(s) | MaxSem, Brion VIBBER, Yuvi Panda |
| Document status | declined |
This proposal was obsoleted by Extension:CommonsMetadata and is now abandoned.
We need a facility to access information from file description pages in a machine-readable format. Bits of information needed are:
- License information
- Image description, in user's preferred language is possible
- Author information
- Date image was produced
- Source of the image
- etc
Commons already has a rich metadata system for Images, Artwork and Books - we should use it.
Storage: page_props vs. dedicated table[edit]
- Some fields (e.g. license information HTML) can be quite large - is it desireable to store them in page_props? It currently uses BLOB for pp_value which can store up to 64k.
- Some information (e.g. descriptions) might come in several languages. Storage options include: page_props with all languages packed into one blob or having a dedicated column for language in a separtate table? MaxSem leans towards the former option.
Query requirements[edit]
In the long term it would be nice to be able to do general queries, like "give me all the images with CC-BY-compatible license that are photographs from 1970 to present within this geo box". In the short term we do not need this. :)
In the short term, we need to be able to request the data for a specific file by name. We should also be able to ask for specific set of properties only - 'get me property X, Y, Z for item File:ABC.jpeg', rather than only 'get me all properties of item File:ABC.jpeg'.
[edit]
- How?
- How important it is, do we need to implement it from the very beginning?
Proposed API draft[edit]
api.php?action=query&prop=filemetadata&fmdprop=description|licenseurl&fmdlanguage=ru
- Allow selecting information in several languages or provide several fallback languages in case information in requested language is not found? Both?
Extension name[edit]
Please suggest something, or the most stupid name will be chosen:P