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Re: [ddlm-group] Fwd: Fwd: Searching for a compromise on eliding. .

Dear Colleagues,

   While John B. is right about what you _can_ do in writing for
proposals F and GP, remember that F and GP include the \\ elide,
which would then allow sensible users to safely double _all_
backslashes that they want carried through unchanged.  These
people will have a lot less trouble in managing their strings
than people who try to work on the sharp boundary of a
protocol that well may change as CIF2 and DDLm shake down in
real use.  The ability to do this in CIF writers, making for very robust
data, is a strong reason to favor P, P-prime, F and GP, over
F' or G.

   Regards,
     Herbert







At 12:15 PM -0600 2/28/11, Bollinger, John C wrote:
>On Monday, February 28, 2011 10:31 AM, SIMON WESTRIP wrote:
>
>>As I understand F or F', doubling of backslashes would only really 
>>be required
>>when a literal backslash is needed at the end of a line, because, 
>>as in python,
>>all unrecognized escape sequences are returned 'as is', e.g.
>>  ``\a\b\c\ \'\"`` will be returned as \a\b\c\ \'\" ?
>
>F' and G would require backslash doubling only when a literal 
>backslash appears at the end of a line.  If a line ends with 
>multiple literal backslashes, then only the last one would or should 
>be doubled.
>
>F and GP would require backslash doubling when a literal backslash 
>appears at the end of a line, and also when a literal 
>double-backslash appears anywhere (in which case both backslashes 
>would need to be doubled, \\ -> \\\\).  Other backslashes could be 
>doubled for consistency, but that would be optional.
>
>These proposals all provide for syntax-level line folding and for 
>including arbitrary text.  So also do P, P', and Q.
>
>
>John
>
>>________________________________________
>>From: Brian McMahon <bm@iucr.org>
>>To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
>>Sent: Monday, 28 February, 2011 15:11:59
>>Subject: Re: [ddlm-group] Fwd: Fwd: Searching for a compromise on eliding
>>
>>I'm still working through my backlog of work and haven't time yet to
>>consider this in detail, but the converstaion has caught my attention:
>>this approach seems to offer us a solution with line-folding and the
>>ability to include arbitrary text. Is that right? If so, persistent
>>doubling of the backslash in cases such as TeX I would consider a
>>minor nuisance compared with the overall gain in functionality.
>>
>>Regards
>>Brian
>
>
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-- 
=====================================================
  Herbert J. Bernstein, Professor of Computer Science
    Dowling College, Kramer Science Center, KSC 121
         Idle Hour Blvd, Oakdale, NY, 11769

                  +1-631-244-3035
                  yaya@dowling.edu
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