Hi Martin, thanks for your reply, I'll give it a try. My current problem is to map my problem to your suggestion of modifying the tree *at parsing time*.
(Of course) my problem is more complex than my first example,
sorry for any confusion caused.
The XML looks more like this:
<root>
<complex>stuff</complex>
<list>
<element>
<param name="x" value="a"/>
<param name="y" value="b"/>
<more params/>
</element>
<element>
<param name="x" value="i"/>
<param name="y" value="b"/>
<more params/>
</element>
<list>
<more complex>stuff</more complex>
</root>
and I have my own set of values for "x",
so I want to use the first <element> as a template
for my own <element>s, setting the value="" of name="x"
to my new values. Finally I want to replace the whole <list>
with my own <list> of my new <element>s.
My number of elements will not correspond
to the number of <element>s in the template file.
So the handlers would need to read ahead to find the first <element>,
create copies of that for each of my values="" and return
the new <list> instead of the one in the file.
I might have to read the file twice, first to obtain the <element>
as a template, create my <list> of these new <element>s, and then
use the handler approach to insert my replacement <list>.
Because there is a lot of <complex stuff/> in there,
I can't write the XML tree from scratch.
If anyone has suggestions how to parse the file,
find the template <element>, create a <list> of them,
and finally replace the original <list>, I am all ears ;-)
Yours,
Steffen
On Wed, 2008-07-02 at 21:00 -0700, Martin Morgan wrote:
> Hi Steffen...
>
> Steffen Neumann <[EMAIL PROTECTED]> writes:
...
> I'm not sure how to do this with internal nodes, but
>
> handlers = list(
> first=function(node, ...) {
> init <- sub("^([[:upper:]]).*$", "\\1.", xmlValue(node))
> xmlNode("initial", init)
> })
> xml <- xmlTreeParse("~/tmp/tr.xml", handlers=handlers, asTree=TRUE)
>
> gives
> > xmlRoot(xml)
> <Duncan>
> <name a="1" b="xyz">
> <initial>D.</initial>
> <last>Temple Lang</last>
> </name>
> </Duncan>
>
> The documentation of xmlTreeParse is written to almost imply that this
> would also work with internal nodes, but I was not able to work
> through this.
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