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Re: Why XML data typing is hard

• From: Joel Bender <joel@s...>
• To: xml-dev@i...
• Date: Tue, 1 Dec 1998 15:18:18 -0500

G. Ken Holman wrote:

>  In Canada, valid expressions of currency numbers are $1.47 or
>  1,47$ based on where you are.

I was under the impression that there was some standard patterns/parsers
for this stuff being designed.  So:

	<value xml:type="currency">1.5</value>

Gets parsed as if it was specified as:

	<value xml:type="currency" xml:country="Canada.English">1.5</value>

(No offense intended to those in French Canada that want to make it their
own country.)

>  I gather from Michael S-McQ in a presentation in Chicago that
>  the regular expression for a valid date (taking into account
>  days of the month and leap years) is 4801 characters long.

Probably an interesting effort, what we used to call a "weekend and a case
of beer" project.  I'm sure that another notation could be found that would
reduce this significantly, roll a little grep and JavaScript together or
something :-).

This discussion is important to me because my application to test protocol
conformance needs to [expletive deleted] in an XML description of an "implementation under
test" and translate the '1.5' into an IEEE float that will appear on a
wire.  My app will need at least some guidence on accepting '1,5' and/or
'1.5' and/or the Japanese Unicode string that means the same thing.  The
good news for me is that I really only need to deal with SQL data types.


Joel

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