On Oct 17 2004, Miguel wrote:


> I have done that. But it's not Cambridge that has the problem (CCSD), > it's the inorganic chemistry structure database (ICSD) out of > Karlsruhe. I pointed them to > http://journals.iucr.org/iucr-top/cif/spec/nonvalues.html
>
> Probably something we should look at carefully ourselves.


Based upon reading this spec it looks to me that missing atom coordinates
should be '?' (unknown) instead of '.' (inapplicable)

I agree. However the semantics of these values is still slightly unclear to me.



I will take a look at the CifReader and make it ignore atoms which have either '?' or '.' in as an atom coordinate.

That looks a good idea. I am not sure how common it is... but if the ICSD uses it it's probably worth considering


P.



Miguel



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