This file is the schema file for us-types (us-types). The DTS starting with this schema file will not contain any linkbases. The Volume item type is used to indicate that an element represents a volume and can be used to express the volume of any substance, whether solid, liquid, or gas. The volume item type indicates whether it is one of the following measures of volume: Liter l; Cubic Meter cubicMeter; Cubic Feet cubicFeet; Gallons gal; Cubic Feet of Natural Gas at 14.73psi and 60 degrees F cf; Thousand Cubic Feet of Natural Gas at 14.73psi and 60 degrees F Mcf; Million Cubic Feet of Natural Gas at 14.73psi and 60 degrees F MMcf; Barrels of Oil at 60 degrees F bbl; Thousands of Barrels of Oil at 60 degrees F MBbls; Millions of Barrels of Oil at 60 degrees F MMbls; The area item type is used to indicate that an element represents an area. This indicates whether it is one of the following measures of area: Square Meter sqm; Square Kilometer sqkm; Hectare ha; Square foot sqft; Square yard sqyd; Square mile sqmi; Square English Mile sqemi; Acre A; The length item type is a measure of distance. This unit can be measured as one of the following: Millimeter mm; Centimeter cm; Meter m; Kilometer km; Inch In; Foot ft; Yard yd; Nautical Mile NMi; Mile Mi; English Mile EnMi; The mass item type is synonym for weight. This represents the mass of an object which can be measured as one of the following: Gram g Kilogram kg Metric ton MT Ounces oz Pounds lb US ton T The energy item type represents a unit of energy. This unit can be measured as one of the following: Joule J Kilojoule kJ Megajoule mJ Calorie Calorie British Thermal Unit Btu Barrel Oil Equivalent Boe Thousand Cubic Feet of Gas Equivalent Mcfe Foot-pound force Foot_Pound_Force kilowatt hour kWh Measures a rate of energy use or energy production and is equivalent to the use or production of energy during a period of time. I.e. a watt is the equal to one joule of energy per second. This unit can be measured as one of the following: Watt W; Kilowatt kW; Megawatt mW; Gigawatt gW; Terrawatt tW; Horsepower hp;