Unclear text in the UBA (UAX#9) of Unicode 6.3

[Eli Zaretskii]

> Date: Mon, 21 Apr 2014 20:32:15 -0700
> From: Ilya Zakharevich <nospam-abuse at ilyaz.org>
> Cc: verdy_p at wanadoo.fr, ken at unicode.org, Eli Zaretskii <eliz at gnu.org>,
>  unicode Unicode Discussion <unicode at unicode.org>, James Clark
>  <jjc at jclark.com>
> 
> Sorry, I do not see any definition here.  Just a collection of words
> which looks like a definition, but only locally…

Any definition is just a collection of words, of course.  Can you tell
what is missing from this collection to make it eligible?

>   1(  2[  3(  4]  5)  6)
> 
> Is looking-at-1 forcing match of 3-and-5?  Or what?

No.