[TYPO3] Can xml_contentrendering pull from an extension?

[Reyes Cuerva, Zandro]

Is it possible for xml_contentrendering to generate xml from content
produced by another extension? 
 
I am pulling files from a document repository (knowledge tree) and
displaying them on my site. I need to publish an rss feed based on the
files that I am pulling from the repository. So everytime a new file is
uploaded in the repository and displayed on my typo3 site, I want a new
RSS notification to be sent out pointing back to the typo3 site.
 
Am I approaching this the right way? Does anyone have an idea as to how
I can do this?
 
Thanks,
 
Zandro

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