query_result.setMetaData( new MemoryMetaData( cols ) );
query_result.addRow( new Object[] { "Enero", 0, 0 } );
query_result.addRow( new Object[] { "Febrero", 0, 0 } );
query_result.addRow( new Object[] { "Marzo", 0, 0 } );
query_result.addRow( new Object[] { "Abril", 0, 0 } );
query_result.addRow( new Object[] { "Mayo", 0, 0 } );
query_result.addRow( new Object[] { "Junio", 0, 0 } );
query_result.addRow( new Object[] { "Julio", 6, 3 } );
Document chartDocument =
XmlDom4JHelper.getDocFromString( "<chart><chart-type>LineChart</chart-type></chart>",