Changing the content of an XML document

[Wolfgang]

> The identity transform will work, and is essentially the same as the 
> transformation function that Wolfgang suggests. However I think a 
> transform expression is easier to understand if eXist supports XQuery 
> Update:
> 
> copy $a := $tree
> modify replace value of node $a//subnode with
>   if($condition) then "some text" else "some other text"
> return $a

Right now, updates are only supported on documents stored in the db (we 
directly modify the persistent dom). To use this approach, the document 
fragment would need to be saved first, which is probably too much 
overhead for a one-time use.

Wolfgang