Indexed XML parsing

Indexed search for XML. 

if XMLs are too big xquery wont be effective because it anyways loads the full XML into memory, I want to be able to search XML directly by giving some index and the relevant portions of XMl should be searched directly from the location with minimum parsing and not definitely by loading the whole XML in memory. Remember some XMLs can be large say 30MB. ( I was not the only one who though this partly microsoft has thought and says use XMLReader, but it doesn't cover the searching part. The searching part is covered by this paper http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.11.9191 )

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