[SPEC] Backwards-compatible metadata in Gemini

[Stephane Bortzmeyer]

On Tue, Feb 23, 2021 at 05:49:19PM -0500,
 Sean Conner <sean at conman.org> wrote 
 a message of 112 lines which said:

> Years ago, there was an extention for Firefox (back when I think it
> was just known as Mozilla) that would use metadata in the <HEAD>
> section of a web page to construct a navigation bar for the site.
> The metadata included:

Actually, it is a concrete form ("serialization") of links, which are
an abstract concept, and can be in HTTP headers ('Link:'), in HTML
text, in Atom feeds, etc.

The standard for links is RFC 8288
<gemini://gemini.bortzmeyer.org/rfc-mirror/rfc8288.txt>. 

> 	next		next "page" in the collection
> 	previous	previous page in the collection
> 	first		first page in the collection

All these are official standardized types of links, in the IANA
registry
<https://www.iana.org/assignments/link-relations/link-relations.xml#link-relations-1>. For
instance, "canonical" was registered in RFC 6596
<gemini://gemini.bortzmeyer.org/rfc-mirror/rfc6596.txt> to link to the
canonical URI of this resource.