[tantek][aciccarello]++ good issue and thanks for helping nudge this forward! We definitely need implementation experience to validate the spec and iterate accordingly! Also thanks for being open to helping out with metaformats [aimee]++
[tantek]definitely give a heads-up if you come upon any questions or weirdnesses that don't align with content you're seeing. I did do a bunch of research for it but expect that there's some cases I missed.
[aciccarello]> if there is no implied head element root class name and there is a meta[property^=og:] or meta[name^=twitter:] then imply a head element root class name of h-entry
[tantek]whereas for example: "if it's "summary" or "summary_large_image" then imply a head element root class name of h-entry" is a more explicit determination that this *is* an h-entry