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RE: patterns and restrictions


how timezones are split
On Wed, 2003-12-17 at 20:16, Michael Kay wrote:

> Using patterns to constrain values other than strings is questionable
> though. Constraining an input document to contain a number such as
> "23.50" rather than "23.5" puts an unnecessary burden on anyone
> generating these documents, especially if they are using XSLT or XQuery
> to do it. It's the value that matters, not its representation.

In most cases, that's very true.

OTH, it can be very useful in some cases, though. For instance, to
constrain dates to either contain or omit timezones, to split durations
into two categories in which they are fully ordered, to impose that
QNames have prefixes, ....

Eric
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