Discussion List Archives

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ddlm-group] Case sensitivity

Dear Colleagues,

   The issue of case sensitivity of data names is the same as was faced for 
HTML, and I believe we must make the same compromise -- having multiple
flavors of the specification, at the very least:

   1.  A case-insentitive version to avoid breaking existing data sets; and
   2.  A case-sensitive version as the direction for the future

   Regards,
      Herbert

=====================================================
  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 Mon, 11 Jan 2010, Joe Krahn wrote:

> If the consensus is lower-case data names, why not make this part of the
> CIF2 standard?
>
> My suggestion is that every data name should have a "printed form"
> defined in the dictionary. That allows upper-case, spaces, subscripts,
> etc. Then, the item name "I_over_sigmaI" can be written as something
> like "I / sigma(I)". Maybe some already do this?
>
> With UTF-8 support, names can include non-ASCII characters, such as
> Greek letters. If non-ASCII characters are used, it might be good to
> have a plain ASCII alias rather than assume that UTF-8 is ubiquitous.
>
> Joe
>
>
> David Brown wrote:
>> There was discussion about case sensitivity of data names at the COMCIFS
>> meeting in Osaka.  My recollection is that we agreed that names should
>> be case sensitive, and to avoid problems with having two data names that
>> differ only in their cases, all data names should be lower case.  There
>> are legacy problems because in DDL1 the data names are case insensitive,
>> and while most of the names have been written in lower case, upper case
>> letters have been traditionally used for proper names, e.g.,
>> _space_group_name_Hall.  There may well be legacy CIFs in which only
>> lower case letters have been used but probably not many.
>>
>> DAvid
>>
>> Joe Krahn wrote:
>>> Is there any interest in making CIF2 case-sensitive, at least data names?
>>>
>>> There was some discussion that names may eventually extend into the UTF
>>> range, even though it would be avoided for the near future. That
>>> complicates case-insensitive matching, because standard library
>>> functions are locale dependent. If data names are not strictly limited
>>> to 7-bit ASCII, it would be good to make names case-sensitive.
>>>
>>> Thanks,
>>> Joe Krahn
>>> _______________________________________________
>>> ddlm-group mailing list
>>> ddlm-group@iucr.org
>>> http://scripts.iucr.org/mailman/listinfo/ddlm-group
>>
>>
>
> _______________________________________________
> ddlm-group mailing list
> ddlm-group@iucr.org
> http://scripts.iucr.org/mailman/listinfo/ddlm-group
>
_______________________________________________
ddlm-group mailing list
ddlm-group@iucr.org
http://scripts.iucr.org/mailman/listinfo/ddlm-group

Reply to: [list | sender only]
International Union of Crystallography

Scientific Union Member of the International Council for Science (admitted 1947). Member of CODATA, the ICSU Committee on Data. Member of ICSTI, the International Council for Scientific and Technical Information. Partner with UNESCO, the United Nations Educational, Scientific and Cultural Organization in the International Year of Crystallography 2014.

ICSU Scientific Freedom Policy

The IUCr observes the basic policy of non-discrimination and affirms the right and freedom of scientists to associate in international scientific activity without regard to such factors as ethnic origin, religion, citizenship, language, political stance, gender, sex or age, in accordance with the Statutes of the International Council for Science.