A managed phase-out of DDL1 dictionaries

James Hester jamesrhester at gmail.com
Mon Apr 24 04:08:03 BST 2017

Dear Matthew,

Thanks for the feedback. There is no plan to completely remove the DDL1
dictionaries from the IUCr website, and they would still continue to be
available from the canonical URL. What will happen is that, after the
transition period, definitions will no longer be updated to mirror any
changes made to their DDLm counterparts.  We anticipate that the number of
such changes to the DDL1 dictionaries during the transition period would in
any case be quite minimal, and most would happen at the point that the
initial DDLm version is approved.  How about we agree to discuss and review
the situation in COMCIFS in 2 years' time rather than mandate a cutoff date?

Incidentallly, I don't think any particular decision has been made on
whether or not to backport new definitions appearing only in DDLm
dictionaries.  That might be worth discussion here as well.

all the best,

On 21 April 2017 at 18:10, Matthew Towler <towler at ccdc.cam.ac.uk> wrote:

> Dear James
> Thank you for publishing this proposal.  I support the proposed process
> for the change over, but am unsure of the timetable.  A few months ago a
> message indicated a web page that listed software that was already DDLm
> compatible.  This morning I have had a search on the IUCr website in the
> DDLm and software sections and could not find it, but what I recall is that
> at the time I looked it was somewhat sparsely populated.  I appreciate
> that a little positive pressure in the direction of change can be a good
> thing, I also recognise the need to work with what already exists.  My
> overall feeling is that the discontinuation of DDL1 dictionaries should be
> driven by software and community adoption, that a date should not be set
> until there is sufficient community uptake.  Otherwise I feel there is a
> risk that discontinuing DDL1 dictionaries will effectively equate to
> discontinuing all dictionary updates.
> I will state that this is entirely my personal view as a CIF user and
> software engineer, rather than being any kind of official view of the CCDC,
> my employer.
> Best wishes,
> Matthew
> the DDL1 dictionaries will be prominently marked as deprecated and after a
> nominal period (say 2 years) maintenance will cease and links to the
> dictionaries will be removed (although their historic URIs cannot be
> changed and so they will not be removed).
> If any of you see an issue with this, please comment.
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