Periphery: A brief history of calendars

It may not be a great concern to most subscribers, but I found the following 
history of calendars interesting:

http://www.obliquity.com/calendar/

It explains the 'g' in xs:gYear.  But not why there's no 'g' in xs:date and 
xs:dateTime :-)

Pete Cordell
Codalogic Ltd
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data binding to convert XSD schemas to C++ classes.
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