Re: [w3ctag/design-reviews] Web Publications review (#344)

> The [canonical definition of `rel=""`](https://html.spec.whatwg.org/multipage/semantics.html#attr-link-rel) is in the HTML Living Standard, which contains no such text.

The use of URLs in `rel` is a long standing extension mechanism used by REST APIs, [RDFa](https://www.w3.org/TR/rdfa-core/#A-rel) (and by extension [Microdata's conversion mappings](https://www.w3.org/TR/microdata/#x6-2-rdfa)), and by (at least) the [Web Annotation Protocol's discovery method](https://www.w3.org/TR/annotation-protocol/#discovery-of-annotation-containers).

So, how does a W3C member help champion the return of that sentence?

For this case specifically, the group has chosen to register the `rel` values with IANA (as well as spec the related URL mappings). However, the `Link` header and `<link>` divergence also requires a "registration" with the [wiki-based registry](http://microformats.org/wiki/existing-rel-values), so that's a potential action this group will also need to take. /cc @iherman @mgarish

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