| Element Summary |
| AmountOfSubstance | Element containing the dimension of the quantity amount of substance. |
| CodeListValue | Element for listing the unit code value from a specific code list. |
| ConversionDescription | Element for a description of the SpecialConversionFrom. |
| ConversionNote | Element for descriptive information. |
| Conversions | Container for providing conversion information to other units. |
| CountedItem | Container for a single counted item. |
| CountedItemSet | Container for items that are counted and are (in practice) combined with scientific units of measure. |
| Dimension | Element to express the dimension of a unit or quantity in terms of the SI base quantities length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. |
| DimensionSet | Container for dimensions. |
| ElectricCurrent | Element containing the dimension of the quantity electric current. |
| EnumeratedRootUnit | Element for a root unit (from an extensive enumerated list) allowing an optional prefix and power. |
| ExternalRootUnit | Element for those special cases where the root unit needed is not included in the enumerated list in the above element. |
| Float64ConversionFrom | Element for providing factors for a conversion equation from another unit; y = d + ((b / c) (x + a)) |
| Item | Element containing the dimension of any item. |
| ItemDefinition | Element to describe the definition of the item. |
| ItemHistory | Element to describe the historical development of the item. |
| ItemName | Element containing the item name(s). |
| ItemRemark | Element as a placeholder for additional information. |
| ItemSymbol | Element containing symbols for the item. |
| ItemVersionHistory | Element for descriptive information, including version changes to the item. |
| Length | Element containing the dimension of the quantity length. |
| LuminousIntensity | Element containing the dimension of the quantity luminous intensity. |
| Mass | Element containing the dimension of the quantity mass. |
| PlaneAngle | Element containing the dimension of the quantity plane angle. |
| Prefix | Element containing information about a prefix. |
| PrefixName | Element containing the prefix name. |
| PrefixSet | Container for prefixes. |
| PrefixSymbol | Element containing prefix symbols. |
| Quantity | Element for describing quantities and referencing corresponding units. |
| QuantityDefinition | Element to describe the definition of the quantity. |
| QuantityHistory | Element to describe the historical development of the quantity. |
| QuantityName | Element containing the quantity name. |
| QuantityReference | Element for all quantities that can be expressed using this unit. |
| QuantityRemark | Element as a placeholder for additional information. |
| QuantitySet | Container for quantities. |
| QuantitySymbol | Element containing various quantity symbols. |
| QuantityVersionHistory | Element for descriptive information, including version changes to the unit. |
| RootUnits | Container for defining derived units in terms of their root units. |
| SpecialConversionFrom | Element for providing unit conversion information for conversions that are more complex than the Float64ConversionFrom linear equation. |
| ThermodynamicTemperature | Element containing the dimension of the quantity thermodynamic temerature. |
| Time | Element containing the dimension of the quantity time. |
| Unit | Element for describing units. |
| UnitDefinition | Element to describe the definition of the unit. |
| UnitHistory | Element to describe the historical development of the unit. |
| UnitName | Element containing the unit name. |
| UnitReference | Element for referencing a unit of measure from within the Quantity element. |
| UnitRemark | Element as a placeholder for additional information. |
| UnitSet | Container for units. |
| UnitsML | Container for UnitsML units, quantities, and prefixes. |
| UnitSymbol | Element containing various unit symbols. |
| UnitSystem | Container for describing the system of units. |
| UnitVersionHistory | Element for descriptive information, including version changes to the unit. |
| WSDLConversionFrom | Element for providing conversion based on SOAP/WSDL calls to a remote server. |
| WSDLDescription | Element to describe the WSDL service. |