27. A volatile or non-volatile machine-readable storage 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 26 .
26. The method of claim 23 , wherein the first data storage model and the second data storage model are each from a group consisting of a CLOB (Character Large Object), an XML view based on relationally-stored data, and a native XML data type.