7. The method of claim 2 , wherein: the particular representation of the XML datatype indicates that the first data is stored by the database server as object-relational storage in one or more columns of second one or more relational tables; and the index information includes an XML table index for the first data, wherein the XML table index stores one or more elements of the first data, wherein the one or more elements are retrieved into the XML table index from the one or more columns of the second one or more relational tables.
20. A machine-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 7 .