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thanks for any help
You would seriously want to ask why you would be doing this. Just because something can be done doesn't mean it would be worthwhile.
Would your audience find value in reading a feed that showed new entries to your directory?
Providing a full feed of your site can make it a lot easier for the scrapers to access your content. However, if there's a real need for the data to be out there then you'll need to look at ways of limiting what you put out.