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   RE: [xml-dev] DAFIF and date formats

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> -----Original Message-----
> From: David Megginson [mailto:dmeggin@attglobal.net] 
> Sent: Sunday, May 02, 2004 20:01
> To: XML Developers List
> Subject: [xml-dev] DAFIF and date formats
> Michael Kay wrote:
> > Their site appears to have a security certificate that 
> expired on 5th 
> > February, or possibly 2nd May.
> If only a standards body could come up with a date format 
> that people from 
> all countries could understand ...

ISO TC 154 is working on a revision of ISO 8601.  I have seen the current
draft and it is a big improvement over the current version of the standard.
(I don't remember at which stage of standardization the new draft is, but I
can easily find out.)

The ASN.1 group of ISO/ITU-T is adding support for date/time datatypes to
ASN.1, based on the new version of ISO 8601.

By the way, XML Schema Part 2 uses the (obsolete) version 1988 of ISO 8601
for its own date/time datatypes.  I hope that the new version of XML Schema
will also adopt the new version of the standard (assuming it is finalized in

(For those who are curious:  The new version of 8601 seems to be getting rid
of the "truncated representation" stuff.  Things like "-month-day" without
the year seem to have disappeared.)

Here are some examples of the normal "extended format" for those who have no
clue about ISO 8601:


	15.1389254435  (or 15,1389254435)


Alessandro Triglia
OSS Nokalva

> Seriously, the DAFIF is a wonderful example of free 
> information online, even 
> if the Web people forget to renew their certificate, or even 
> to come up with 
> a domain name to associate with the IP address.  If anyone is 
> interested in 
> a medium-size, free (as-in-beer and as-in-speech) dataset to 
> convert to XML 
> and test with tools, I highly recommend the DAFIFT (the tab-delimited 
> version), which includes worldwide information on thousands 
> of airports, 
> runways, air traffic service frequencies, air routes, etc. etc.
> The U.S. government leads the world in making this kind of 
> data freely 
> available, however much it sticks in my Canadian throat to say so. 
> Converting the tab-delimited tables to XML is fairly trivial, 
> as long as you 
> read the data dictionaries first.
> All the best,
> David
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