5. The method of claim 2 , wherein each base table row includes: a document identifier column uniquely identifying an Extended Markup Language document, and one or more Extended Markup Language columns storing information pertaining to the Extended Markup Language data for the Extended Markup Language document, wherein each Extended Markup Language column has a corresponding internal Extended Markup Language table storing the Extended Markup Language data.
6. The method of claim 5 , wherein the one or more Extended Markup Language columns include an Extended Markup Language indicator column, the Extended Markup Language indicator column containing update timestamps indicating the latest time of update to the document identified by the document identifier column.