Re: [Wikitech-l] Final Call for comments: RFC Canonical data URLs for machine readable page content

This is a final call for comments on <https://phabricator.wikimedia.org/T161527>, "Canonical data URLs for machine readable page content". This RFC was discussed in a public RFC meeting on the wikimedia-office channel on April 12. It was agreed that the RDF be put on Final Call: if no new pertinent concerns are raised by April 26th, the RFC will be approved for implementation. Meeting log: <https://tools.wmflabs.org/meetbot/wikimedia-office/2017/wikimedia-office.2017-04-12-21.07.html> The RFC has been discussed before, and proöposed for final call, but some new concerns where indeed raised, which were then addressed in the above discussion. Log of the original meeting: <https://tools.wmflabs.org/meetbot/wikimedia-office/2017/wikimedia-office.2017-03-29-21.01.log.html> The RDF proposes: * Use URLs of the form https://commons.wikimedia.org/data/main/Data:Avignon_City_Wall.map to identify and retrieve machine readable page content. "main" refers to the main slot, see T107595. * The /data/<slot> path is rewritten to a special page, Special:PageData * Special Special:PageData will redirect (with status 303) to an appropriate (and typically cacheable) URL for retrieving the page data. For now, this will use the action=raw interface. * Special:PageData may apply content negotiation based on the Accept header sent by the client. In the first iteration, it will only check if any accept header sent by the client is compatible with the content model of the requested page. * The 303 redirects are not cecheable for now, because they depend on the Accept header; complex normalization would be needed to allow the cache to vary on the Accept header without causing massive cache fragementation. Please see the phabricator ticket for a summary of the concerns raised and addressed.