Victor Vianu. 

The development of XML technology has occurred very rapidly, initially leaving theory behind. As is often the case in such situations, practical development sometimes seemed more ad-hoc than well principled. There is now a substancial body of work providing formal foundations for XML. This paper presents a personal perspective on some recent developments in the theory of XML.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbbd/2003/paper002.pdf

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