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Re: XQuery and DTD/Schema?

• To: "Michael Kay" <michael.h.kay@n...>
• Subject: Re: XQuery and DTD/Schema?
• From: Jeni Tennison <jeni@j...>
• Date: Mon, 8 Jul 2002 11:26:20 +0100
• Cc: "'Dare Obasanjo'" <dareo@m...>, "'Jonathan Robie'" <jonathan.robie@d...>, "'Mike Champion'" <mc@x...>, <xml-dev@l...>
• In-reply-to: <002301c22665$2ecf11b0$6401a8c0@pcukmka>
• Organization: Jeni Tennison Consulting Ltd
• References: <002301c22665$2ecf11b0$6401a8c0@pcukmka>
• Reply-to: Jeni Tennison <jeni@j...>

Mike,

> One design approach, of course, is for functions to return () (or
> other special values such as NaN) rather than throwing errors. The
> disadvantage of this is that there is no opportunity to provide
> diagnostics indicating the nature of the failure.

I had the (probably baseless) impression that an "error object" would
be returned rather than thrown, with its value being an error message
or something, so you could do something like:

  let $date := cast as xs:date('2002-02-29')
  if   ($date instance of error)
  then concat('Invalid date: ', $date)
  else ...

Is that not feasible?
  
Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/

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  • RE: RE: XQuery and DTD/Schema?
    • From: "Michael Kay" <michael.h.kay@n...>

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