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Re: CIF-JSON draft 2017-05-15



On 16 May 2017 at 04:16, Robert Hanson <hansonr@stolaf.edu> wrote:
Two points:

1. I do not understand the stripping of "data_" and "save_" from the names we have for these.

These are stripped as the data_ and save_ parts of the names perform a syntactical role in CIF, and the JSON curly brace essentially replaces their syntactical function of encapsulation.  Put another way, requiring that datablock names started with 'data_' would be unnecessary additional baggage.

2. Save frames.  What is the problem with just doing this?


     "data_another_block":{
        "_abc":["xyz"],
        "save_internal":{"_abc":["yzx"],
                        "_r.fruit":["apple","pear"],
                        "_r.colour":["red","green"]}
                        },
     }
That is, why the special "frames" list?

Well, we could do it the way you suggest, perhaps with a capital 'S'.  Is there any reason to prefer one over the other? I would have thought that putting all save frames under a single name would make processing a datablock slightly easier, as you don't have to check every block entry for the 'save_' sequence when running through a datablock, especially as these frames only occur in dictionaries.  To get all save frames under the current spec you would just have to go something like:

defs = myjson['blockname']['frames']

but if you need them under your proposal you'd have to go something vaguely like:

defs = myjson['blockname']
save_names = defs.keys().filter(key[0:5] == "save_")

The former approach is faster, and seems simpler but perhaps that's just me?



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