[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

RE: RE: XQuery and DTD/Schema?


xquery error handling
-----Original Message----- 
From: Michael Kay [mailto:michael.h.kay@n...] 
Sent: Mon 7/8/2002 2:52 AM 
To: Dare Obasanjo; 'Jonathan Robie'; 'Mike Champion'; xml-dev@l... 
Cc: 
Subject: RE: RE:  XQuery and DTD/Schema?

>If you have any constructive suggestions as to what kind of error-handling facility would keep your face straight,
> I'm sure the WG will be interested in hearing it. 
 
I seem to remember a proposal for a function similar to the ternary operator in C for which the syntax escapes me. Something like 
 
   attempt(expr-to-attempt, expr-to-execute-on-success, expr-to-execute-on-failure)
 
which although not as complex as a structured exception handling mechanism like those in conventional programming languages like C# or C++ should satisfy users in most cases and not be onerous to implement. More complex exception handling mechanisms can be added in later versions of XQuery after user feedback has been gathered.  
 
>Note that XSLT also has problems in this area: the inability of applications to deal with errors from the document() function is a perennial user complaint.

True. 

>One design approach, of course, is for functions to return () (or other special values such as NaN) rather than throwing errors. 

I personally believe this should be avoided as much as possible. The empty set (or sequence) is not the error value and should not be used interchangeably with it. 


PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
 

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.


Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.