[XSL-LIST Mailing List Archive Home] [By Thread] [By Date]

Re: [xsl] 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/

---