ISSUE-30: rang and lang entities

rang lang

State:: OPEN
Product:
Raised by:: David Carlisle
Opened on:: 2008-04-11
Description:: Having gone to some lengths to keep all html entities unchangd due to the size of the installed user base, html5 just changed two of them...

In general we have removed (at MathML3) all uses of CJK punctuation symbols (U+30xx) in favour of specific mathematical brackets added in Unicodes 3.1 to 5)

However Unicode shows what looks like the result of historical confusion over rang (and lang is the same).

HTML4 and mathml2 map rang to U+232A (RIGHT-POINTING ANGLE BRACKET), which would be fine (normal symbols block) except that it has canonical decomposition to
U+3009 (RIGHT ANGLE BRACKET) that is back in the CJK block that we want to avoid.

So Unicode 3.1 added U+27E9 (MATHEMATICAL RIGHT ANGLE BRACKET) and Ian H is suggesting we, and (x)html switch to this.

I think we should (assuming html WG thinks it can get away with changing html)
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