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RE: Relative XPATH between 2 nodes

2005-01-28 11:51:15
You might like to look at the algorithm Saxon uses for determining relative
document order between two nodes in a structure such as JDOM that doesn't do
this natively. It basically walks up from both nodes (stepping each
alternately) to find a common ancestor, then finds the relative sibling
position of the nodes that are children of this common ancestor.

Michael Kay
http://www.saxonica.com/

-----Original Message-----
From: Lyublinski, Leonid 
[mailto:Leonid(_dot_)Lyublinski(_at_)AntaresSolutions(_dot_)com] 
Sent: 28 January 2005 16:40
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] Relative XPATH between 2 nodes

Right, I had to be more specific.

There is a defined XML document and XSLT to build.
I need to built a template which takes 2 parameters - 2 
single nodes or
2 xpath expression resulting in 1 and only 1 node each.
This template supposed to create a XPATH expression, a short 
cut between
2 given nodes.

Do you want the shortest XPath expression, or the XPath expression
whose evaluation touches fewest nodes?
  following-sibling::*[5]/child::*[2]
or
  following::*[29]

The first one it is.
To my understanding the 1st (and longer) expression will be processed
faster.
I might be wrong though.


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