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

On Thursday, September 30, 2010 2:37 PM, Herbert J. Bernstein wrote:

>   Working from the original DDLm/dREL spec, I did not see anything precluding comments within bracketed >costructs and have therefore programmed on the assumption that they have to be allowed.  The CIF2 spec simply >does not discuss the issue, but explcitly allows whitespace within bracketed constructs.
>   We should decide what we really want here and document it

On Thursday, September 30, 2010 2:42 PM, Herbert J. Bernstein wrote;
>In paragraph 46, the CIF 1.1 spec says:
>46. White space comprises all appropriate combinations of spaces, tabs, ends of lines and comments, as well as the beginning of the file.
<WhiteSpace> are the characters able to delimit the lexical tokens.
>So, as things now stand the proposed CIF2 spec _would_ allow comments within bracketed construct because it explcitly permits whitespace in bracketed constructs.

Unfortunately, the current draft of the Changes document contains a definition of "whitespace" that does not include comments.  I'm not sure how that came about or whether it has some purpose I do not see, but I find it a bit strange.  I think it would at times be useful to have comments in bracketed structures, and my existing code will allow it (in part because I didn't recognize until now that there was a question about it).

Is there a reason why we should not reintroduce comments to the definition of whitespace?


John C. Bollinger, Ph.D.
Department of Structural Biology
St. Jude Children's Research Hospital

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