Re: [xsl] xpath key problems

[Martin Honnen <Martin.Honnen@xxxxxx>]

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/