rel-alternate
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rel=alternate is a way to indicate that a hyperlink links to an alternate representation of the current page. See: http://microformats.org/wiki/rel-alternate.
In particular, in regard to linking to translations, see: http://microformats.org/wiki/rel-alternate#with_hreflang
IndieWeb Examples
Aaron Parecki
As of 2018-07-29, Aaron Parecki's post permalinks have a rel=alternate link to alternative representations in Microformats JSON, jf2, and ActivityStreams 2.0 formats.
For example, the page at https://aaronparecki.com/2018/07/12/10/indieauth includes the following in the HTML <head>
:
<link rel="alternate" type="application/mf2+json" href="https://aaronparecki.com/2018/07/12/10/indieauth.json" /> <link rel="alternate" type="application/jf2+json" href="https://aaronparecki.com/2018/07/12/10/indieauth.jf2" /> <link rel="alternate" type="application/activity+json" href="https://aaronparecki.com/2018/07/12/10/indieauth.as2" />
These alternative URLs for the post return the post in the specified formats. The Microformats JSON and jf2 URLs are generated automatically by running the generated HTML through a Microformats parser and XRay and returning the parsed result instead of the HTML.