Persistent URLs/linked data support?

I'm hacking around with RDF and linked data for my own research, and I'd like to be able to point to my library items on zotero.org— for example, marking that a particular item is my source for information about a given historical event. I have 2 questions:

1) Can I expect that the URL of any given item in my library will be persistent over time?

2) Any chance that you'll be adding the ability to view individual library items in RDF format, just like the Firefox plugin exports them to a single file on my machine?
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