An ontology to integrate data from heterogeneous sources for carbon footprint Catte: emission factor (kg CH4/cabeça/ano). Ruminant_Animal_Emission_Factor values were entered in SWRL rules true CO2 Balance per hectare FarmArea: balance_CO2_ha true CO2 Balance in each area of the farm FarmArea: balance_CO2_area true CO2 emission in each area of the farm FarmArea:CO2_emission_area true CO2 sequestration in each area of the farm FarmArea:CO2_stock_area