[SG16] Draft proposal: Clarify guidance for use of a BOM as a UTF-8 encoding signature

[James Kass]

On double-checking it turns out that these aren't (upper-) ASCII strings 
after all.  They're just ANSI strings.  Please see attached graphic.  My 
bad, sorry for the confusion (and the two typos) in my earlier post.

I was trying to point out the similarity between the hex byte strings 
used in UTF-8 and hex byte strings used in HTML NCRs to point to a 
character's USV.  That similarity exists no matter how poorly my 
assertion was phrased.

Perhaps it would have been better to point out the similarity between 
surrogate pairs and UTF-8.  Think of UTF-8 as being surrogate pairs (or 
trios or quadrupeds or whatever) which point to a Unicode character.

A system substitutes a Unicode value for the UTF-8 hex byte string 
before further processing can occur.
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