@grib ARIA is most similar to mf2 markup but is limited to how things work, and are accessible, on a specific site rather than the interaction between sites. There is definitely a relationship but it has a certain purpose rather than being the fuel to power connection.
@grib for example I created functions for Post Kinds to prepend an accessible emoji onto post content instead of using text or icon. I think that's more semantic, but the aria-label on the post is stripped out by feed clients
@colinwalker I know what you're saying and I agree for the most part but the mixture of mf2 and new post kinds at indieweb.org/posts makes me think aria-label would be a perfect fit to describe jams, likes, eats etc. alongside h-entry
@colinwalker then again I'm coming at this totally new and with my head full of EPUB, DPUB and the plethora of ARIA and A11Y discussion we're having there and I could just be wrong