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No, it can be specified in the config file and cannot be changed at run time. To what extent you want the url to be dynamic? What are you trying to model? If you can explain there would be an alternative for it. Perhaps define more than one feed adapters if you know the finite set of urls where you desire to receive feed from?
I have an atom feed and I want to be able to only get the newest content, my atom feed has the ability to only grab information after a given time, I want to change the URL to specify the last time the information was polled.