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Re: [ddlm-group] A modest addition to the DDLm spec. .

Dear Nic,

   If the spec is quoted string literal + quoted string litera;,
+4 is no problem, it is just +4.

   "breaking the underlying structure of a
> tag-value construct in the original STAR/CIF" is no more done
by this extension than it was by the bracketed constructs.

   Could we stick to the practical reality of:

   1.  Is this useful to a reasonable number of people? and
   2.  Does it break anything?

I believe the answers are yes and no.  Do you have any specific
evidence to the contrary?

   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
                  [email protected]
=====================================================

On Fri, 1 Oct 2010, Nick Spadaccini wrote:

> And there in lies the first incompatibility.
>
> _atom_site.charge +4
>
> Is not allowed. But -4 is.
>
> In all honesty I can't see how breaking the underlying structure of a
> tag-value construct in the original STAR/CIF in this way actually improves
> any backwards compatibility to CIF1 - which I must admit I don't see as such
> a high priority to warrant these machinations.
>
> With my usual disclaimer that these are comments only and IUCr and your
> group need to work out what you want CIF to be.
>
>
> On 1/10/10 1:16 AM, "Herbert J. Bernstein" <[email protected]>
> wrote:
>
>> You must, of course, quote all pluses not being used as a
>> concatenation operator.
>>
>> =====================================================
>>   Herbert J. Bernstein, Professor of Computer Science
>>     Dowling College, Kramer Science Center, KSC 121
>>          Idle Hour Blvd, Oakdale, NY, 11769
>>
>>                   +1-631-244-3035
>>                   [email protected]
>> =====================================================
>>
>> On Thu, 30 Sep 2010, Bollinger, John C wrote:
>>
>>> On Thursday, September 30, 2010 10:18 AM, SIMON WESTRIP wrote:
>>>
>>>> First thought is how does this work in loops?
>>>>
>>>> loop_ _item
>>>> 'abc' + 'def'
>>>
>>> One specific (but synthetic) example I was thinking of was along the same
>>> lines:
>>>
>>> loop_
>>> _amino_acid.code
>>> _amino_acid.optical_rotation_direction
>>> 'ALA' +
>>> 'ARG' +
>>> 'LEU' -
>>>
>>>> But I need to check whether + is one of the characters that is not allowed
>>>> to start a
>>>> non-delimited string...
>>>
>>> It is not.  Those are " ' _ $ [ {
>>> If the proposal is adopted then adding + to that list would reduce the added
>>> complications for parsing.  That would be incompatible with using the
>>> optional leading + with numeric values, however.
>>>
>>>> Otherwise I see no reason not to explore this.
>>>
>>> I see no reason at all not to explore it.  Notwithstanding the above, I have
>>> not yet formed an opinion on this question.
>>>
>>>
>>> Regards,
>>>
>>> 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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>>> ddlm-group mailing list
>>> [email protected]
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>>>
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>
> cheers
>
> Nick
>
> --------------------------------
> Associate Professor N. Spadaccini, PhD
> School of Computer Science & Software Engineering
>
> The University of Western Australia    t: +61 (0)8 6488 3452
> 35 Stirling Highway                    f: +61 (0)8 6488 1089
> CRAWLEY, Perth,  WA  6009 AUSTRALIA   w3: www.csse.uwa.edu.au/~nick
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>
>
>
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