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

For expressions and / operator in XPath 2.0 (Was: Re:

Subject: For expressions and / operator in XPath 2.0 (Was: Re: result = node1 * node2 and then get total of all the result from whole document at the end)
From: Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>
Date: Wed, 2 Jan 2002 15:36:51 +0000
xml and operator
Mike wrote:
> In XPath 2.0 the answer is
>    sum(for $r in //rate return $r/@value * $r/@quantity)

I feel sure that this is one of the more contentious aspects of XPath
2.0, but here goes...

Why is it that the General Steps have to return nodes? If they didn't,
you could do something like:

  sum( //rate/(@value * @quantity) )

I thought that the answer might be to do with the old set vs. sequence
thing, and the fact that for backwards compatibility, the / operator
has to union and sort the nodes.

However, I can't work out why you can't just say that the / operator
performs a union on node identity and a sort on document order; simple
typed values have neither node identity nor document order, so
sequences of simple typed values are left as they are.

Can someone enlighten me?



Jeni Tennison

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

Current Thread


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.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3
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.