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Re: [ddlm-group] Role of separators in CIF
- To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
- Subject: Re: [ddlm-group] Role of separators in CIF
- From: Brian McMahon <bm@iucr.org>
- Date: Tue, 1 Dec 2009 10:55:03 +0000
- In-Reply-To: <279aad2a0911302156m7645df42r171e4b2291c99abc@mail.gmail.com>
- References: <C7398588.126B6%nick@csse.uwa.edu.au><275884.79342.qm@web87006.mail.ird.yahoo.com><84104.25546.qm@web87002.mail.ird.yahoo.com><753987.29972.qm@web87006.mail.ird.yahoo.com><279aad2a0911302156m7645df42r171e4b2291c99abc@mail.gmail.com>
I want to vote "For" on this proposition, but I'm concerned by Nick's assertion of 9 October http://www.iucr.org/__data/iucr/lists/ddlm-group/msg00038.html (1) restricting the character set of non-delimited strings is NON-NEGOTIABLE. If we don't restrict it, then we can't build recursive data structures and exploit DDLm. I understood this to be definitely ruling out the embedding of the quote characters in non-delimited strings, but I've lost track of the details of the subsequent discussions. Regards Brian On Tue, Dec 01, 2009 at 04:56:52PM +1100, James Hester wrote: > *NOTE REQUEST FOR VOTE BELOW* > > Simon: From reading your previous emails, I'm guessing that the source of > your concern is that the possible characterset of non-delimited strings > appears more restrictive than is strictly necessary. In particular, you're > not sure why we have excluded quote and double quote from non-delimited > strings. > > You are correct that the other CIF2 syntax does not require that quote or > double quote are excluded from non-delimited strings (apart from the first > character, of course). The exclusion of the quote/double quote was on > general principle of keeping all characters that serve as delimiters out of > non-delimited strings, even if those characters could never cause confusion. > It also has the benefit of allowing some syntax errors to be picked up. > > Nick is with me in Sydney, and we have decided that this is the sort of > issue that we just have to vote on, as the arguments either way are not > conclusive. > > I would therefore call everybody to vote on the following proposition: > > "That <quote> and <double quote> may appear in non-delimited strings, as > long as they are not the first character" > > Voting so far: > > Against: Nick > For: James > Agnostic: ? > > -- > T +61 (02) 9717 9907 > F +61 (02) 9717 3145 > M +61 (04) 0249 4148 _______________________________________________ ddlm-group mailing list ddlm-group@iucr.org http://scripts.iucr.org/mailman/listinfo/ddlm-group
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