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Re: [ddlm-group] Summary of proposed CIF syntax changes

Aren't the following in the core dictionary, and need changing?

_symmetry_space_group_name_H-M
_refine_ls_shift/esd_max
_refine_ls_class_[]

As I suggested below, CIF2 code should allow CIF1 names, possibly with 
warnings, and just exclude them from dREL, unless they can be mapped 
dictionary aliases.

Joe


David Brown wrote:
> Simon,
> 
> I am not sure what changes are needed in CIF1 dictionaries.  I would be 
> interested to know since any changes have to be passed through the 
> coreCIF Dictionary Maintenance Group that I chair.  It is my 
> understanding that no changes are needed, and if they are they must be 
> changes that do not invalidate the reading of any of the archive.
> 
> David
> 
> SIMON WESTRIP wrote:
>> I understand the name alias approach - what I was trying to highlight is
>> the fact that current dictionaries will need to be re-written and this
>> in itself might be more of an issue when selling CIF2 than the fact 
>> that commas
>> as list separators could be on the table.
>>
>> Cheers
>>
>> Simon
>>
>> ------------------------------------------------------------------------
>> *From:* Joe Krahn <[email protected]>
>> *To:* Group finalising DDLm and associated dictionaries 
>> <[email protected]>
>> *Sent:* Friday, 4 December, 2009 20:23:09
>> *Subject:* Re: [ddlm-group] Summary of proposed CIF syntax changes
>>
>> SIMON WESTRIP wrote:
>> > I agree that a "rationale for all of the quotation rule
>> > changes" might be welcome - I can imagine that at first glance many 
>> people
>> > will wonder what the """ and ''' are for.
>> >
>> > I'm not sure that hinting that comma-separated lists
>> > are also a possibilty is going to help matters?
>> My willingness to support commas is partly because Herbert finds it
>> usefule, and has already implemented it. Maybe the comma-delimited
>> variant can be useful as a CIF 1.5 transitional form?
>>
>> > Afterall, when it comes down to it, until there are
>> > dictionaries that comply to CIF2, many disciplines
>> > that already make use of CIF will find it difficult to
>> > adopt CIF2 because their current dictionaries will be invalidated by
>> > the restrictions on the dataname character set?
>> Name changes are not uncommon, at least for mmCIF. Hopefully, dictionary
>> aliases will ease the conversion. It would also help if early CIF2
>> software should probably allow CIF1 names within the CIF2 syntax, with
>> warnings, and just exclude them from dREL.
>>
>> Joe
>> >
>> > Cheers
>> >
>> > Simon
>> >
>> >
>> >
>> > ------------------------------------------------------------------------
>> > *From:* Joe Krahn <[email protected] <mailto:[email protected]>>
>> > *To:* Group finalising DDLm and associated dictionaries
>> > <[email protected] <mailto:[email protected]>>
>> > *Sent:* Friday, 4 December, 2009 17:49:01
>> > *Subject:* Re: [ddlm-group] Summary of proposed CIF syntax changes
>> >
>> > The summary did not include a rationale for all of the quotation rule
>> > changes, which is the area that makes the least sense to me.
>> >
>> > The section defining the rationale for not allowing lexical characters
>> > outside the 7-bit range (the first Reasoning paragraph) might mention
>> > that it affords faster parsing by deferring any UTF-8 conversions.
>> >
>> > I see that the commas were left out of the list syntax. It may be good
>> > to put a short paragraph about the alternative comma-delimited syntax,
>> > so that other people reviewing the proposal have a chance to comment.
>> >
>> > Thanks,
>> > Joe Krahn
>> > _______________________________________________
>> > ddlm-group mailing list
>> > [email protected] <mailto:[email protected]> 
>> <mailto:[email protected] <mailto:[email protected]>>
>> > http://scripts.iucr.org/mailman/listinfo/ddlm-group
>> >
>>
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>> ------------------------------------------------------------------------
>>
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> 
> 

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