Mashing up Multiple WebIDs and Pods

Tim Berners-Lee @timbl Aug 26 14:17 said in gitter/solid/chat

@joepio Thanks for the link to all the UI material and ideas.
I’d like us to design interfaces to our sold stuff, whatatever pods it may be on. I’d like to be able to by default look at stuff in four pods, and at each point, say looking at photo albums or photos, be able to turn on and off different pods from the merged view.
Like layers on a map.

He reiterated similar ideas in the SolidOS meeting on 2021-09-08 and also mentioned a related feature - the ability to use multiple identities simultaneously while keeping the identities hidden. If I'm understanding correctly, combining this idea with the one above would mean I could be looking at a mashup of my photos from my work and play IDs without anyone but me knowing that I am associated with both IDs.

My thoughts are that these kinds of things are most easily doable by authorizing an ID for multiple pods - if my workID Pod and my playID Pod both assign the homeID as authorized to read photos I'm all set after one login. But it might also be worth considering the longer route for SolidOS - let all WebIDs operate simultaneously. If I try to get resource X with WebID Y and that doesn't work, the app tries WebID Z or offers a new login prompt.

No files, tests, or entry points are named. Start by identifying the existing WebID, pod authorization, and login flows; completion requires an agreed design and acceptance criteria for merged views and simultaneous identities before implementation can be judged done.