[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Reply to: [list | sender only]
Re: [ddlm-group] Space as a list item separator>
- To: "Nick.Spadaccini@uwa.edu.au" <Nick.Spadaccini@uwa.edu.au>, Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
- Subject: Re: [ddlm-group] Space as a list item separator>
- From: Joe Krahn <krahn@niehs.nih.gov>
- Date: Wed, 02 Dec 2009 14:00:06 -0500
- In-Reply-To: <C73BE39D.12731%nick@csse.uwa.edu.au>
- References: <C73BE39D.12731%nick@csse.uwa.edu.au>
I assume that quoting rules are the same: any string containing delimiter characters must be quoted. Normally, that is just whit space, but includes comma in the list context. Also, are adjacent commas invalid, or valid as the undefined ".", or as the unknown "?"? Joe Nick Spadaccini wrote: > Since this issue is not yet fully closed, for clarification as delimiters of > tokens within a compound data type, comma and space are not exactly > equivalent. The delimiters (that are equivalent) are > > [:space:]+ # --- for white space delimited > > [:space:]* , [:space:]* # --- for comma delimited > > [:space:] matches a single whitespace character, * is the Kleene Star > meaning zero (0) or more instances of a matche and + is the Kleene Plus > meaning one (1) or more instances of the match. > > With that qualification, I agree with Herb's assessment. > > On 1/12/09 8:35 PM, "Herbert J. Bernstein" <yaya@bernstein-plus-sons.com> > wrote: > >> If both comma and space are permitted then I would treat >> >> [1, 2, 3 4 ] or [1,2,3 4] >> >> as equivalent and equivalent to >> >> [1 2 3 4] and [1 , 2 , 3 , 4] and [ 1 2 3 4 ] >> >> At least that is the way I have coded CIFtbx and CBFlib. >> ===================================================== >> 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 Tue, 1 Dec 2009, John Westbrook wrote: >> >>> Could I ask for a clarification of the interpretation of a mixed case >>> such as: >>> >>> [1, 2, 3 4 ] or [1,2,3 4] >>> >>> If quote and space are permitted are the above going to satisfy the >>> syntax requiremens? >>> >>> John >>> >>> >>> Herbert J. Bernstein wrote: >>>> First amending the arguments >>>> >>>> To summarise the arguments: >>>> >>>> 1. In favour of both space and comma >>>> - comma is used in some other non-CIF contexts as a list delimiter >>>> - comma allows a large subset of lists and arrays to be carried >>>> opaquely in CIF 1 and CIF 1.1 documents. >>>> >>>> 2. Against comma: >>>> - A single type of separator makes the grammar simpler >>>> - Space is used everywhere else in CIF as a separator (consistency) >>>> - Comma can then be used in non-delimited strings >>>> >>>> Then >>>> >>>> I vote for comma and space -- 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 Tue, 1 Dec 2009, James Hester wrote: >>>> >>>>> Dear CIF2 people: the time has come to vote on the list item separator >>>>> issue. Firstly: as far as I know, nobody is against space as a >>>>> separator, >>>>> so spaces will be possible list item separators. Some may be against >>>>> commas, so this vote is on whether or not to allow commas. >>>>> >>>>> To summarise the arguments: >>>>> >>>>> 1. In favour of both space and comma >>>>> - comma is used in some other non-CIF contexts as a list delimiter >>>>> >>>>> 2. Against comma: >>>>> - A single type of separator makes the grammar simpler >>>>> - Space is used everywhere else in CIF as a separator (consistency) >>>>> - Comma can then be used in non-delimited strings >>>>> >>>>> Space only: Nick, James (Nick is here) >>>>> Comma and Space: ? >>>>> >>>>> On Tue, Dec 1, 2009 at 5:30 PM, James Hester <jamesrhester@gmail.com> >>>>> wrote: >>>>> More specifically, CIF1.1 excludes square brackets as the first >>>>> character in a non-delimited string. >>>>> >>>>> >>>>> On Tue, Dec 1, 2009 at 9:33 AM, James Hester <jamesrhester@gmail.com> >>>>> wrote: >>>>> Dear Herbert: as CIF 1.1 doesn't define lists, I'm not >>>>> sure why you suggest that the example below is a valid >>>>> tag. >>>>> >>>>> On Tue, Dec 1, 2009 at 12:36 AM, Herbert J. Bernstein >>>>> <yaya@bernstein-plus-sons.com> wrote: >>>>> Sorry something got lost in the prior message. >>>>> It should have >>>>> read: >>>>> >>>>> Dear Colleagues, >>>>> >>>>> Back to the question of commas. >>>>> If you accept the desirability of >>>>> having a CIF 1.5, commas in lists >>>>> become very useful. Someone with >>>>> a CIF 1.1 editor will be able to >>>>> prepare a CIF 1.5 file for many >>>>> useful cases by doing all lists >>>>> with commas and no embedded blanks >>>>> as long as they can make their >>>>> lists fit on single lines. In CIF >>>>> 1.1 >>>>> >>>>> [[1,2,3],[4,5,6],[7,8,9]] >>>>> >>>>> is a valid value for a tag, but >>>>> >>>>> [[1 2 3] [4 5 6] [7 8 9]] >>>>> >>>>> is not. >>>>> >>>>> >>>>> No, neither example is a valid CIF 1.1 tag. CIF 1.1 explicitly >>>>> excludes brackets as the first character of a non-delimited >>>>> string. >>>>> >>>>> >>>>> Having the option of commas in lists >>>>> will help to smooth the >>>>> transition for at least some people. >>>>> >>>>> >>>>> _______________________________________________ ddlm-group mailing list ddlm-group@iucr.org http://scripts.iucr.org/mailman/listinfo/ddlm-group
Reply to: [list | sender only]
- Follow-Ups:
- Re: [ddlm-group] Space as a list item separator> (Nick Spadaccini)
- References:
- Re: [ddlm-group] Space as a list item separator> (Nick Spadaccini)
- Prev by Date: Re: [ddlm-group] Role of separators in CIF
- Next by Date: [ddlm-group] Syntax summary? Wiki?
- Prev by thread: Re: [ddlm-group] Space as a list item separator>
- Next by thread: Re: [ddlm-group] Space as a list item separator>
- Index(es):