return IReportElementConstants.DATA_COLUMN_PREFIX + "[\"" + DEUtil.escape( colName ) + "\"]";
return getColumnExpression(colName);
	public static String getExpression( Object model )	{		if ( model instanceof ParameterHandle )		{			return IReportElementConstants.PARAMETER_PREFIX					+ "[\"" + ( (ParameterHandle) model ).getName( ) + "\"]"; //$NON-NLS-1$ //$NON-NLS-2$		}		if ( model instanceof DataSetItemModel )		{			String colName = ( (DataSetItemModel) model ).getAlias( );			if ( colName == null || colName.trim( ).length( ) == 0 )			{				colName = ( (DataSetItemModel) model ).getName( );			}			return /*					 * Roll back because engine hasn't support full path yet					 * IReportElementConstants.DATA_SET_PREFIX + "[\"" + (					 * (DataSetHandle) ( (DataSetItemModel) model ).getParent( )					 * ).getName( ) + "\"]." +					 */IReportElementConstants.DATA_COLUMN_PREFIX					+ "[\"" + DEUtil.escape( colName ) + "\"]";//$NON-NLS-1$ //$NON-NLS-2$		}		return null;	}