Schema.org v13 release candidate (target ~2021-07-07)

Dear Schema.org Community Group / Steering Group / interested parties,

Based on discussions here and in Github, here is a proposal for a new
Schema.org release, version 13.0, which I would like to publish in early
July.

There may be a few definitions to tweak / polish but the basic shape of a
release is here.

https://webschemas.org/docs/releases.html#v13.0

cheers,

Dan

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for Schema.org.