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Re: XPath 1.5? (was RE: typing and markup)

• To: <xml-dev@l...>
• Subject: Re: XPath 1.5? (was RE: typing and markup)
• From: Ian Fitchet <ian.fitchet@l...>
• Date: Tue, 07 May 2002 20:26:22 +0100
• In-reply-to: <000a01c1f5f2$8ac45d20$6501a8c0@pcukmka> ("Michael Kay"'smessage of "Tue, 7 May 2002 19:10:58 +0100")
• References: <000a01c1f5f2$8ac45d20$6501a8c0@pcukmka>
• Sender: Ian Fitchet <idf@l...>
• User-agent: Gnus/5.090007 (Oort Gnus v0.07) Emacs/21.1 (i386-pc-solaris2.9)

"Michael Kay" <michael.h.kay@n...> writes:

>>  Is there any means of indicating non-W3C types?
>>
> Sure, you can define a type called american-date as a restriction of
> xsd:string, constrained by a regular expression, and you can then define
> functions that convert an american-date to an xsd:date and you can then use

 That is fine where xsd:date is a superset of whatever date I am using.  

 What I want to do is define a date within my context which has a
 meaning to other people (but not necessarily you).  For example, my
 archaeological date would want to be able to support comparisons
 between:

<date>Jurassic +500</date>
<date>Cretaceous</date>
<date>Jurassic +200</date>

 Do you really want to convert my dates into a ``standard'' date to do
 comparisons?  Does your date cope in my context?  Roll on
 astrological dates.

 My date means something to me and the systems I exchange documents
 with.  Why should I have to subvert an elegant solution (for me)?

 As I said, I'd like to think that all the work being done on
 supporting strong types in XML is able to allow me to define my
 strong types without reference to yours.

Cheers,

        Ian

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  • RE: XPath 1.5? (was RE: typing and markup)
    • From: "Michael Kay" <michael.h.kay@n...>

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