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Erik works in UC Berkeley's School of Information where he teaches Web Architecture and XML Technology courses. He has been working with XML since its invention, and is mainly interested in anything related to XML documents and the models they represent, which means schema languages, transformations, Web services, and query languages. His second major field of interest is Web Architecture and how to use it to build open information systems. The main application areas he is currently looking at are mobile Web and location, and e-learning and Open Content.