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Re: [ddlm-group] Which brakets are reserved?

• To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
• Subject: Re: [ddlm-group] Which brakets are reserved?
• From: Nick Spadaccini <nick@csse.uwa.edu.au>
• Date: Sat, 21 Nov 2009 01:50:37 +0800
• Authentication-Results: postfix;
• In-Reply-To: <alpine.BSF.2.00.0911200929340.32484@epsilon.pair.com>

On 20/11/09 10:35 PM, "Herbert J. Bernstein" <yaya@bernstein-plus-sons.com>
wrote:

> This one should hopefully be easy:
> 
> Which brackets are the reserved brackets in CIF2?  From what I
> have heard thus far, I believe that te current proposal is:
> 
>    {} and [] are reserved brackets with special meaning in CIF2 and ()
> are not.

Correct. The concept of a tuple may have meaning in a programmatic context
and therefore may be used operationally within dREL (however I see no real
use for them), it has no meaning in terms of a CIF value in a file.

Furthermore with the parsing rules in the new specification if () were
special it would break with values such as 2.334(5), which would cause a
great deal of concern.
 
>    Note that I am not asking which characters are not allowed in
> non-delimited strings and nor the synatx of data names, just

Just for the record my current proposal states data names cannot have (),
but data values can.

> which of the original sets of brackets from 2007 ({}, [] and ())
> are still flags for a bracketed construct.

Just {} - associative arrays and [] - lists. Both recursive.

>    Is this correct?

Yes.

cheers

Nick

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