Miguel wrote:

Basically you can have any readable linear expression in x, y, and z:,
including unary operators and simple fractions, each separated by a
comma from the next:

x + 0.5, 1/3 + y, -z - 1/2

I am not trying to be a pain in the neck, I just asked for a URL.

sorry, I see myself that the two at the top don't really get you where you want to go. Maybe these will help:

http://www.iucr.org/iucr-top/cif/cifdic_html/1/cif_core.dic/Ispace_group_symop_operation_xyz.html
http://www.iucr.org/iucr-top/cif/cifdic_html/1/cif_core.dic/Isymmetry_equiv_pos_as_xyz.html

Still, they don't really discuss syntax exactly. Perhaps someone else on the list has a better link.

I suppose the exact syntax would depend upon what system is being employed -- some might not allow 1/2 and instead require 0.5. What reference would you have for that? I guess the International Tables referred to in that second link is your best bet for a "most generally acceptable" sytax, which I think I've captured in that method.

Bob



Miguel



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