Release of the cif_core_restraints dictionary and superscript mark up

[David Brown]

Matthew,

In CIF the only restrictions on a text field are related to the use use 
of delimiters.  If no delimiters are used, characters such as white 
space are clearly not allowed since white space is the default 
delimiter.  ', " and [CR]; are allowed delimiters, and clearly whichever 
delimiter is used to open the text field cannot be used within the text 
field.  The other special characters were all developed by the editorial 
office in Chester for the purposes of typesetting and are not part of 
the CIF standard and are not subject to CIF control.  CIF allows other 
typesetting conventions consistent with the above restrictions, see for 
example section 24 (Embedded symantics) of the 'common semantic 
features' document.  This section is referred to in the following 
section 25 'CIF conventions for special characters in text'.  I believe 
even Acta Cryst recongizes TEX when it appears, suitable labelled, in a 
text field, though I don't know if it is ever used.

David


Matthew Towler wrote:

> Thanks for the explanation David, I will send my suggested changes to 
> Brian.
>
>  
>
> If you will indulge me, then for future reference it would help me to 
> clarify where the CIF standard ends and local convention begins.  My 
> understanding has been that the CIF standard is defined by the 
> documents "File syntax" and "Common semantic features".  In the 
> latter, in section "CIF conventions for special characters in text" 
> http://www.iucr.org/resources/cif/spec/version1.1/semantics#specialchars  
> the ^^ and ~~ markup for superscripts and subscripts are defined.  Is 
> this part of this document a part of the formal 1.1 specification?
>
>  
>
> Matthew
>
>
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