RE: [xsl] reordering elements based on...

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Jorg:

The high-level skinny on Muenchian grouping:

1. Establish a way to group the nodes you want grouped
2. Select and process only one (typically the first) of the nodes in each group
3. When you process it, also pick up and process the others in the group

We usually use keys to establish the grouping: it's handy and efficient. 
(This can also be done with raw XPath, though you'll find performance will 
degrade on anything but small documents).

Since XPath 1.0 has no direct way to test node identity, the de-duplicating 
step (2) is usually done with either of two non-obvious techniques:

- compare generate-id of a selected node with the generated id of the first 
node in the group to which your selected node belongs
- count the nodes in the set formed by the union of a selected node and the 
first in its group: if it equals 1, they're the same node.

Enjoy,
Wendell

At 07:57 AM 7/25/2003, you wrote:
> Up to me now to find out how exactly this muenchian method grouping works.


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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