Unicode "no-op" Character?

Mark E. Shoulson via Unicode unicode at unicode.org
Wed Jul 3 16:54:31 CDT 2019

What you're asking for, then, is completely possible and achievable—but 
not in the Unicode Standard.  It's out of scope for Unicode, it sounds 
like.  You've said you realize it won't happen in Unicode, but it still 
can happen.  Go forth and implement it, then: make your higher-level 
protocol and show its usefulness and get the industry to use and honor 
it because of how handy it is, and best of luck with that.


On 7/3/19 2:22 PM, Ken Whistler via Unicode wrote:
> On 7/3/2019 10:47 AM, Sławomir Osipiuk via Unicode wrote:
>> Is my idea impossible, useless, or contradictory? Not at all.
> What you are proposing is in the realm of higher-level protocols.
> You could develop such a protocol, and then write processes that 
> honored it, or try to convince others to write processes to honor it. 
> You could use PUA characters, or non-characters, or existing control 
> codes -- the implications for use of any of those would be slightly 
> different, in practice, but in any case would be an HLP.
> But your idea is not a feasible part of the Unicode Standard. There 
> are no "discardable" characters in Unicode -- *by definition*. The 
> discussion of "ignorable" characters in the standard is nuanced and 
> complicated, because there are some characters which are carefully 
> designed to be transparent to some, well-specified processes, but not 
> to others. But no characters in the standard are (or can be) ignorable 
> by *all* processes, nor can a "discardable" character ever be defined 
> as part of the standard.
> The fact that there are a myriad of processes implemented (and 
> distributed who knows where) that do 7-bit ASCII (or 8-bit 8859-1) 
> conversion to/from UTF-16 by integral type conversion is a simple 
> existence proof that U+000F is never, ever, ever, ever going to be 
> defined to be "discardable" in the Unicode Standard.
> --Ken

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