Provenance semi-rings

One joy of my recent visit to Penn (see below) was a chance to look at recent work by Val Tannen and others on a generalized model of provenance. Reading these papers was the perfect way to brighten up my trip home. Truly elegant.

Todd J. Green, Grigoris Karvounarakis, Val Tannen. Provenance semirings. PODS 2007, Beijing, China.

J. Nathan Foster, Todd J. Green, Val Tannen. Annotated XML: queries and provenance. PODS 2008, Vancover, Canada.

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