disregarding the underscore is no problem. It is just extraneous, right?

also, Jmol should ignore this name and simply read the symmetry operator
information in those files. No?

> Unfortunately CIFs produced with Crystallographica
> http://www.crystallographica.co.uk/ appear to have optional underscores in
> the Hall symbol which cause 10.9.80 to fail silently eg:
>
> _symmetry_space_group_name_Hall '-P_2'
>
> This underscore is equivalent to a space according to the CIF spec:
> http://www.iucr.org/iucr-top/cif/.checking/symmetry_checklist.html
> and is only needed if the symbol is not enclosed in quotes.
>
> In general, if the Hall space group symbol is not recognised perhaps Jmol
> should fall back on the H-M symbol. And if explicit operators are given
> these should be preferred.

Definitely it should be reading the operators -- if it doesn't recognize
the name and has operators it should still be fine.

I'll take a look at some of these files when I get a chance.

Bob

>
> Unfortunately Crystallographica also uses a CIF non-standard end-of-file
> line:
> _eof
> which also causes 10.9.80 to fail ( _eof should simply be ignored - it is
> flagged as a Warning by Encifer).
>
> Alan.
> _____________________________________________________________
> Dr Alan Hewat, ILL Grenoble, FRANCE<[EMAIL PROTECTED]>fax+33.476.20.76.48
> +33.476.20.72.13 (.26 Mme Guillermet)  http://www.ill.fr/dif/people/hewat/
> _____________________________________________________________
>
>
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