The question isn't one of ease of parsing (we all know YAML isn't easy to parse :-). It is a matter of ambiguity. The !<verbatim> syntax was added very late in the game, to allow avoiding the tag prefix games.

The thinking isn't "domain" vs. "local", the thinking is "full arbitrary URI" (inside <...>) vs. "suffix added to some arbitrary URI prefix" (without the <...>). The difference between "!", "!!" and "!foo!" is just "which URI prefix should we use here".

If we said "we don't attach any prefix if what follows the "!" looks like a complete URI" we'd be entering a world of pain. URIs can be in all sort of forms: "urn:isbn:0-395-36341-1" is a URI and hence (if someone wanted) !<urn:isbn:0-395-36341-1> would be a valid (if somewhat insane) tag. So "looking like a complete URI" isn't really easy to define. "Looking like a tag URI" is well-defined, but YAML really doesn't insist on using "tag URIs", even though we call the "node type tags", well, tags.

Have fun,

Oren Ben-Kiki



On Sun, Feb 3, 2013 at 8:02 PM, Trans <transfire@gmail.com> wrote:
I was reading over the spec on Tags. There is an aspect of it that is confusing. To the general viewer, it is not intuitive that the following tag is not a "domain" tag:

    --- !tag:foo.org:org

It is actually a local tag with a very domain-esque name. The correct tag is:

    --- !<tag:foo.org:org>

That's a very technical distinction and I think too difficult.

Would it be acceptable to just designate domain tags as any tag that contains a `:` or `/`? I realize it might not be as efficient to parse, but it would be a whole lot more comprehensible to humans.


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