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

Re: xpath key problems

Subject: Re: xpath key problems
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Sun, 21 Nov 2010 19:42:11 +0100
Re:  xpath key problems
Birnbaum, David J wrote:

     <!-- Two problems, the first of which is fatal:
         1. Doesn't work; key returns nothing
             Change @use to "." and it returns the current element
             Change @use to any function (e.g., string-length(.) or name(.)) and it returns nothing (?)
             Same results with . or current() or self::node() or nothing; does the choice matter here?
         2. Very slow
             Is this inevitable with the long axes or can it be optimized (Saxon HE 9.2.1.2)?
             Likely to get *much* slower when we also count lines (see below)
     -->
     <!-- desired result: @folio value for most immediately preceding<pb>  in same ms (specific hm28x)
         1. get all preceding<pb>  elements
         2. restrict the set to those in the same ms
         3. take the last (immediately preceding) one of those
     -->
     <!-- interim simplifications
         Must handle first page of each ms specially, since there is no preceding<pb>
         Contents of each ms line requires additional templates
         Eventually must also count<lb>  elements between that most recent preceding<pb>  and current location;
             full pointer will be something like 312r14, where 312r is the page and 14 is the line on the page
     -->
     <xsl:key name="msline-pb" match="hm281 | hm280 | hm282"
         use="preceding::pb[parent::*/name() eq name()][1]/@folio"/>

You might want
use="preceding::pb[parent::*/name() eq name(current())][1]/@folio"
to define your key but I am not sure I understand what you want to do with the key as



<xsl:template match="hm281 | hm280 | hm282">

             <pointer>
                 <xsl:value-of select="key('msline-pb',.)"/>

this passes the contents of the 'hm28x' elements to the key function while above you define the value as something like '282r'. The contents seems to be text like 'P2 P;Q#QP>. RP5R Q!R P3R. ' so I don't see what you want to do with that key.



--


	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/

Current Thread

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
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.