Bug 199834 Enable access to IContent object in IReportItemPresentation layer
In IReportItemPresentation layer, the extended item may want to access properties from current IContent object, for example, bookmark, content style. So we need expose the content object in this layer.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/QueryResultSet.java
{
		/**
		 * Returns the number of columns in a detail row of the result set.
		 * 
		 * @return the number of columns in a detail row.
		 */
		public int getColumnCount( )
		{
			return 0;
		}
		/**
		 * Returns the column name at the specified index.
		 * 
		 * @param index
		 *            The projected column index.
		 * @return The name of the specified column.
		 * @throws BirtException
		 *             if given index is invalid.
		 */
		public String getColumnName( int index ) throws BirtException
		{