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Re: [ddlm-group] DDLm aliases (subject changed). .. .. .. .

The problem is not that the current alias scheme cannot clone the DDL2
alias scheme, it is that it does not handle the full capabilities of
DDLm to help manage dictionaries effectively.  The, to use the new
term, "identifer_set" scheme is an extension to better match those
capabilities and simplify dictionary maintenance in the future as,
hopefully, dictionaries consolidate on DDLm, but data and software remain 
heavily invested in DDL1 and DDL2 data files and in reading and writing
and validating DDL1 and DDL2 formats.

=====================================================
  Herbert J. Bernstein, Professor of Computer Science
    Dowling College, Kramer Science Center, KSC 121
         Idle Hour Blvd, Oakdale, NY, 11769

                  +1-631-244-3035
                  yaya@dowling.edu
=====================================================

On Thu, 27 Jan 2011, Bollinger, John C wrote:

> On Thursday, January 27, 2011 12:08 PM, Herbert J. Bernstein wrote:
>
>>> One problem with treating the xref as the ensemble, is that with DDLm,
>>> we are moving into having multiple dictionaries for one ensemble, and
>>> even now, with DDL2, we are in the same state with imgCIF, in which
>>> the ensemble spans both the imgCIF and mmCIF dictionaries.
>>>
>>> Another problem is that, again with the move to DDLm, one dictionary
>>> can be home to multiple ensembles.
>
> Indeed so.  Xref is not a viable substitute for ensemble_id in the general case.
>
> Nevertheless, associating an alias with one or more ensembles is not an 
> essential part of declaring that alias in the first place.  Whether to 
> use ensembles at all is up to dictionary authors and maintainers. 
> Everything in the current proposal that has an analog among DDL2 alias 
> features is in the ALIAS or DICTIONARY_XREF category.
>
> John
>
>> --
> John C. Bollinger, Ph.D.
> Department of Structural Biology
> St. Jude Children's Research Hospital
>
> Email Disclaimer:  www.stjude.org/emaildisclaimer
>
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>
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