Extending XML::LibXML through XS

Hi,

I have a perl application that needs to walk an XML::LibXML DOM tree
in order to display it in a Gtk2::TextView. I have to recursively go
through each node as I need to highlight them with the proper style.
The multitude of XS calls triggered by this are hurting the
application's performance.

I rewrote this part in C and I need to link it to perl through XS. The
Gtk2 bindings make this possible by installing the typemap and .h
files that they use. I can easily pass a Gtk2::Widget from perl to XS,
so this part is covered.

Right now I'm struggling with the exchange of LibXML types between
perl and XS. I could only find the typemap file used by XML::LibXML in
the source distribution, so I had to copy it. Now my module builds but
it can't be loaded, perl gives me the following error message:

symbol lookup error: Xacobeo/XS/XS.so: undefined symbol: PmmSvNode

How can I manage to pass the XML::LibXML data types from perl to XS?
Are the typemap and header files of XML::LibXML shareable with other
modules?

-- 
Emmanuel Rodriguez
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