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Re: [ddlm-group] Character set for data block and save frame codes

Hi John,

I believe you are correct that the expanded character set is available
to save frames and data block names.  I think datanames were picked on
specifically because they play a central role in datafiles and
dictionaries, whereas save frames occur only as a placeholder in
dictionaries, and data block names are largely arbitrary.  So the
latter two were not addressed specifically.

We should amend the draft to include this explicit enlargement of the
save_frame/data block name character set.

James.

On Sat, Jun 19, 2010 at 5:56 AM, Bollinger, John C
<John.Bollinger@stjude.org> wrote:
> Hello All,
>
>
>
> The current spec defines an expanded character set (relative to CIF 1.x) for
> data names, but it does not explicitly do the same for data block or save
> frame codes.  Inasmuch as the CIF2 spec is written in terms of changes to
> CIF1, it is not clear to me whether data block and save frame codes are
> allowed to use the same expanded character repertoire (based on the general
> expansion of the character set), or whether they are still under CIF1 rules
> (because no specific change is made).  If the former, then it’s not clear to
> me why data names are called out specifically and the others are not.
>
>
>
> I speculate that data names are called out for historical reasons, on the
> assumption that the comments relating to data names in a DDLm dictionary may
> at one time have been actual restrictions.  I infer that it is the intent
> that the expanded character set be available to data block and save frame
> codes, but I am not confident about that.  Am I right?  It would be helpful
> if this were explicit.
>
>
>
>
>
> John
>
> --
>
> John C. Bollinger, Ph.D.
>
> Department of Structural Biology
>
> St. Jude Children's Research Hospital
>
>
>
>
>
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