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Re: [ddlm-group] Treatment of CIF2 unicode characters with CIF1equivalents

  • To: ddlm-group <ddlm-group@iucr.org>
  • Subject: Re: [ddlm-group] Treatment of CIF2 unicode characters with CIF1equivalents
  • From: James Hester <jamesrhester@gmail.com>
  • Date: Fri, 28 Apr 2017 09:09:15 +1000
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Hi Simon and others,

I think I prefer this approach of clarifying markup conventions for CIF2, and so we drop the more CIF2->CIF1 translation approach I had initially proposed. Natural translations to ASCII strings will suggest themselves in the process.  This is in the spirit of the CIF2 syntax paper appendix as well.

As a simple solution, I suggest that the markup conventions described in Vol G 2.2.7.4 remain available under the same conditions as described in 2.2.7.4.13.  There are then two ways to represent the Unicode code points corresponding to the characters listed in 2.2.7.4.14-16.  Any other approach is likely to be fraught, as "ASCII string" is a subset of "UTF-8 string" and switching on and off markup depending on the presence of non-ASCII characters is fragile behaviour.

Should we introduce "triple backslash" to represent backslash, as double backslash is already used?

If we agree, I suggest that it is added to our CIF2 FAQ and eventually finds its way into the equivalent of 2.2.7.4 in the new Vol G.

all the best,
James.
 

On 26 April 2017 at 23:05, SIMON WESTRIP <simonwestrip@btinternet.com> wrote:
Hi James

I think that the 'common semantic features' need reviewing fully in any revision of Vol G,
not only in the light of CIF2 (e.g. I'm not sure it currently states how to represent a literal backslash,
does C:\foldername\filename contain Greek phi... :-)

So **if** the subject of CIF2->CIF1 is to be addressed in this context and recommendations made,
why not extend the semantics?
I'd prefer not to prescribe any conventions for CIF2->CIF1;
rather clarify the use of some these semantics with CIF2.
Although the IUCr journals have yet to receive/publish a CIF2, I suspect that when it does there will be CIF2
files that contain 'CIF1 markup'...

Cheers

Simon

PS just for info: I use \#xxxxxx when handling any unicode that isn't covered by the CIF1 semantics -
but that is very rare.




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