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[Bug 2133] R-142: Order relation for gMonthDay, gMonth, gDay

From: <bugzilla@wiggum.w3.org>
Date: Mon, 12 Sep 2005 15:07:21 +0000
To: www-xml-schema-comments@w3.org
Cc:
Message-Id: <E1EEptx-0002Cb-Oq@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=2133

           Summary: R-142: Order relation for gMonthDay, gMonth, gDay
           Product: XML Schema
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSD Part 2: Datatypes
        AssignedTo: cmsmcq@w3.org
        ReportedBy: sandygao@ca.ibm.com
         QAContact: www-xml-schema-comments@w3.org


The order relation on date is specified as:

"If date values are considered as periods of time, the order relation on date 
values is the order relation on their starting instants."
This makes sense to me.

The order relation on time is specified as:

"The order relation on time values is the Order relation on dateTime (3.2.7.3) 
using an arbitrary date."
This also makes sense to me.

Now consider the order relation on eg gMonthDay:

"If gMonthDay values are considered as periods of time, the order relation on 
gMonthDay values is the order relation on their starting instants."
I don't think this is quite right. A gMonthDay is not a single period of time 
but a recurring period. The dateTime ordering relation compares two specific 
instants of time. Thus in order to turn a gMonthDay into a specific instant of 
time, you need to use an arbitrary year (just as with time you need to use an 
arbitrary date). However, I'm guessing --02-29 is allowed as a gMonthDay; if 
so, the year is not an arbitrary year but an arbitrary leap year.

So the spec should say something like:

"If gMonthDay values are considered as periods of time using an arbitrary leap 
year, ..."
Similarly, for gMonth and gDay.

See:
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0045.html
Received on Monday, 12 September 2005 15:07:28 GMT

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