XQuery Optimization

We take a closer look at the optimization problems that are associated with the XQuery language. We discuss the research that has been done and some open problems along with potential solutions. XQuery is a quite young standard and many issues with respect to optimization remain unresolved. This work will focus on three aspects of optimization in XML databases being: duplicate removal, XML algebras and indices. It is done in close cooperation with the development team of the Galax XQuery Engine from AT&T Labs and Lucent Bell Labs. Eventually, we aim to implement our optimization results into the Galax en-