On Thu, Jun 2, 2011 at 5:33 PM, Frank Bennett <[email protected]> wrote: > On Fri, Jun 3, 2011 at 4:20 AM, Bruce D'Arcus <[email protected]> wrote: >> More on EDTF that has relevance for CSL. Thoughts? >> >> >> ---------- Forwarded message ---------- >> From: Ray Denenberg, Library of Congress <[email protected]> >> Date: Thu, Jun 2, 2011 at 2:50 PM >> Subject: Re: A three level suggestion >> To: [email protected] >> >> >> Saašha, I do think the three-level suggestion has merit and is worth >> considering further. >> >> The spec could be represented as: >> Level 0: a profile of 8601 >> Level 1: first-level extensions >> Level 2: second level extensions >> >> And to claim conformance, you must at least support level 1 (support >> for level 2 includes support for level 1). >> >> Level 0 would be the 100 and 200 features. >> >> For level 1, I suggest: >> - uncertain/approximate excluding internal. >> - intervals, excluding those with uncertain/approximate and temporal >> expressions, but including open and unknown. >> - masking with "u" > > The specification certainly is firming up. Dates for citation purposes > wouldn't fit neatly into the level scheme,
That was my sense as well, except that I think we could settle on saying CSL could support levels 0 and 1, plus a few features in 2? I also conclude it's unlikely we'd want to suggest any concrete changes to the way Ray has sliced the levels? > but the feature list is > very helpful for clarity. > > In a quck trawl, I've marked items that seem fully within scope for > citation dates with **, those which could be used with some data loss > with ++, and those which seem out of scope without some extension of > CSL with --. Nice list; on quick look, I agree. Bruce > **101 Date (with hyphen) > ++102 Date and time (date with hyphen, time with colon) > **103 Year and month > **105 Year > --108 Duration > ++109 Date with time zone indicator > **111 Negative year > --203 100 year period > **208 Interval: years > **209 Interval: months > **210 Interval: days > --211 Interval: start and duration > ++301 uncertain year > ++302 uncertain year-month > --3021 Year known, uncertain month within year > ++303 uncertain date > --304 year, month known; uncertain day > --305 uncertain year; month, day known > ++306 Approximate year > ++307 Approximate month > ++308 Approximate day > ++309 Time and day approximate > --310 Time is approximate but the event occurred on a known day > --311 Day is approximate; year month, time known. > --312 unspecified year within a known decade > --313 unspecified month within a known year > --314 unspecified day within a known month > --315 Internal "unspecified" > --316 One of a set > --317 Multiple dates > --3171 Multiple Dates via mask character > **320 Interval: unknown start > **321 Interval: unknown end > --322 Interval: open end > --325 Named period or event as the endpoint of an interval > --326 Temporal Expressions; Named periods/event > --329 Calendar > --330 Year requiring more than four digits > ++331 Season > > > >> >> Level 2: >> - Lists (one of a set, all of a set) >> - internal uncertain/approximate >> - temporal expressions >> - calendar >> - long year >> - season >> - masking with "x" >> >> Please comment. I will hold off on further BNF changes pending some >> agreement on this. >> >> --Ray >> >> >>> -----Original Message----- >>> From: Discussion of the Developing Date/Time Standards >>> [mailto:[email protected]] On Behalf Of Bruce D'Arcus >>> Sent: Wednesday, May 25, 2011 9:07 AM >>> To: [email protected] >>> Subject: Re: [DATETIME] A three level suggestion >>> >>> On Wed, May 25, 2011 at 8:38 AM, Saašha Metsärantala <[email protected]> >>> wrote: >>> > Hello! >>> > >>> > I wonder what you think about the following suggestion. >>> > >>> > Keeping in mind that EDTF is thought of as >>> > >>> > "both a profile of and extension to ISO 8601" >>> > >>> > according to >>> > >>> > http://www.loc.gov/standards/datetime/spec.html >>> > >>> > we could skip "reinventing the wheel", define the first EDTF level as >>> > a profile of ISO 8601 and just add some constraints on ISO 8601 to >>> > build the first level of EDTF. This could make both the BNF and the >>> > coming regexes easier to write, just carving away what we do not want >>> have. >>> > >>> > Thereafter, we could have a second level thought of as an extension >>> of >>> > the first level. Thus, we could use the BNF just to add features to >>> > the first level. I'm particularly thinking of lists, "x", longYears, >>> > seasons and temporal expressions. There would not be any "uncertain, >>> > approximate, unspecified" here. Well, ... "temporal expressions" and >>> > seasons may contain a kind of approximation, but I suggest to place >>> > them in the second level anyway. >>> >>> - where would intervals go? >>> - not clear why 'x' is here and not below? >>> >>> Bruce >>> >>> > Thereafter, we could have a third level thought of as an extension of >>> > the second level. Thus, we could use the BNF just to add features to >>> > the second level. I'm particularly thinking of "?", "~" and "u". >>> There >>> > we would introduce "uncertain, approximate, unspecified". >>> > >>> > Comments are welcome! >>> > >>> > Regards! >>> > >>> > Saašha, >>> > >> >> ------------------------------------------------------------------------------ >> Simplify data backup and recovery for your virtual environment with vRanger. >> Installation's a snap, and flexible recovery options mean your data is safe, >> secure and there when you need it. Discover what all the cheering's about. >> Get your free trial download today. >> http://p.sf.net/sfu/quest-dev2dev2 >> _______________________________________________ >> xbiblio-devel mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/xbiblio-devel >> > > ------------------------------------------------------------------------------ > Simplify data backup and recovery for your virtual environment with vRanger. > Installation's a snap, and flexible recovery options mean your data is safe, > secure and there when you need it. Discover what all the cheering's about. > Get your free trial download today. > http://p.sf.net/sfu/quest-dev2dev2 > _______________________________________________ > xbiblio-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/xbiblio-devel > ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Discover what all the cheering's about. Get your free trial download today. http://p.sf.net/sfu/quest-dev2dev2 _______________________________________________ xbiblio-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/xbiblio-devel
