Joomla Customization Content Import using XML and SOAP

Content is provided via XML feed, RSS feed and also by pulling content via a SOAP-connection in PHP from other server. The content should remain dynamically pulled from other server (so it is always up-to-date), while Joomla CMS should recognize it by its unique ID and offer the Joomla standart functionality like rating, email, create pdf etc. (So actually I think the database entry should only be the rating connected to the pulled unique id, while the up-to-date date like text, pic etc. should remain being pulled in realtime from the XML/RSS/SOAP)