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Semantic Publishing of Desktop Data

I came across an article on semantic publishing of desktop data by Knud H. Moller et al on Monday. This article present an interesting idea of augmenting RDF metadata to objects on individual desktop computer by means of blogs. The prototype was implemented specifically for Mac OS X to provide metadata for Personal Information Management (PIM) entries. I feel that the authors are trying to mimic Tim Berners-Lee et al.'s vision in the famous Semantic Web article in Scientific American magazine. The article discuss a lot about how to create and publish these metadata. Anyway, as soon as I finished reading this article many questions arose: How will these metadata be queried? How may these metadata on desktop objects be published across the Internet/Intranet? Will the metadata be referred to URIs? What could the strategy to map these URIs to PIM entries on the desktop software?

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