Populates this {@code WebRowSet} object withthe contents of the given {@code ResultSet} object and writes itsdata, properties, and metadata to the given {@code Writer} object in XML format.
NOTE: The {@code WebRowSet} cursor may be moved to write out thecontents to the XML data source. If implemented in this way, the cursor must be returned to its position just prior to the {@code writeXml()} call.
@param rs the {@code ResultSet} object with which to populate this{@code WebRowSet} object
@param writer the {@code java.io.Writer} object to write to.
@throws SQLException if an error occurs writing out the rowsetcontents in XML format