Okey, after some troubles with eclipse's svn client now a new template handling based on the xmlel object structure is online.
The main behaviour is implemented in the 'xmlel_exttmpl' class. The class takes a xmlel object and automatically filles the template. This will help to make development more easier and faster, because you don't have to implement a special template class for each API call.
It also makes template creation more flexible - if you don't neet special template markers.