Unify Anchor and Tag syntax

Is there any reason the syntax for tags and anchors is so different?

Tags currently allow "[]," and disallow "non-URI characters". Some parts 
of the 1.2 spec also say that "[]," are not allowed but this may be a 
mistake.

Anchors allow all non-blank characters except "[{}],".

I would propose that the exact same syntax be used for both, by changing 
both to the anchor rule (thus disallowing "[]," in tags).

If desired, the "verbatim tag" with '<' and '>' around it could allow 
"[]," which I think would get you the desired ability to quote URLs.

I see no harm in allowing "non-URI characters" in the tags. The current 
libyaml parser complains if the tag ends with anything other than a 
blank, so this will not break anything.

Bill


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