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