xslt renderer: 2 questions

dear developers

- would it be possible to use the renderer for non-silva content? e.g. 
for an uploaded silva file asset which is an xml file from a external 
program. or should this xml file be included into a silva document 
using external sources?

- is it possible to let the user choose the renderer with a link in the 
public view of a page? e.g. i have a standard listing with the default 
renderer but i would like to have more views with more details of the 
same data. for this task the user should be able to click on some links 
on the page.

regards,
marc