Library for Quantity Kinds and Units: schema, based on QUDV model OMG SysML(TM), Version 1.2
2009-08-26
2010-09-06
http://purl.oclc.org/NET/ssnx/qu/qu
Working group of the SysML 1.2 Revision Task Force (RTF)
W3C Semantic Sensor Network Incubator Group
This ontology is partially based on the conceptual model for Quantities, Units, Dimensions, Values (QUDV) to define systems of units and quantities for use in system models proposed by a working group of the SysML 1.2 Revision Task Force (RTF), working in close coordination with the OMG MARTE specification group. This Model Library for Quantities, Units, Dimensions and Values (QUDV) is described in OMG SysMLTM, Version 1.2 Appendix C.4 Model Library for Quantity Kinds and Units http://ontolog.cim3.net/file/resource/reference/UoM_Ontology_Standard/available-UoM-references/QUDV-Annex-C4-C5--OMG-SysML-v1-2_Oct-2009.pdf (Note: the SYSML-QUDV definitions are flagged with a rdfs:seeAlso annotation equal to with http://www.omgsysml.org/qudv.
This ontology is developed as a complement to the Agriculture Meteorology example showcasing the ontology developed by the W3C Semantic Sensor Networks incubator group (SSN-XG). For more information on the group's activities see: http://www.w3.org/2005/Incubator/ssn/ .
Please report any errors to the Semantic Sensor Network Incubator Activity via the public W3C list public-xg-ssn@w3.org or alternatively, to the QUDV mailing list: http://www.omg.org/publicarchives/qudv/
Copyright 2010 W3C.
http://www.w3.org/2005/Incubator/ssn/
code
short symbolic name
A code is a string that uniquely identifies an individual.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:closeMatch 'code' [QUDT] http://qudt.org/
conversionFactor
Rational number that specifies the factor in the unit conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'factor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
conversionOffset
Rational number that specifies the offset in the unit conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'offset' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
definitionURI
URI that contains an authoritative definition of the referent thing
URI that references an external definition.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'definitionURI' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
description
Textual description
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'description' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
exponent
Rational number that specifies the exponent of the power to which the unit is raised.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'exponent' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
conversionExpression
Specifies the unit conversion relationship in some expression syntax.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'expression' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
name
human-readable word or sequence of words by which a thing is known
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'name' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
numericalValue
Specifies the numerical value.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'value' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
symbol
short symbolic name
Short symbolic name.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'symbol' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
symbolicExpression
Symbolic expression of the quantity dimension's product of powers, in terms of symbols of the kinds of quantity that represent the base kinds of quantity and their exponents.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'symbolicExpression' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
unitMultipleFactor
Specifies the multiple or submultiple multiplication factor.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Data
skos:exactMatch 'factor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
ConversionBasedUnit
1
A ConversionBasedUnit is an abstract classifier that is a Unit that represents a measurement unit that is defined with respect to
another reference unit through an explicit conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'ConversionBasedUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
DerivedUnit
A DerivedUnit is a Unit that represents a measurement unit that is defined as a product of powers of one or more other
measurement units.
For example the measurement unit “metre per second” for “velocity” is specified as the product of “metre” to the power one
times “second” to the power minus one
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'DerivedUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
GeneralConversionUnit
1
A GeneralConversionUnit is a ConversionBasedUnit that represents a measurement unit that is defined with respect to another
reference measurement unit through a conversion relationship expressed in some syntax through a general mathematical
expression.
The unit conversion relationship is defined by the following equation:
valueRU / valueCU = f(valueRU, valueCU)
where:
valueRU is the quantity value expressed in the referenceUnit, and,
valueCU is the quantity value expressed in the GeneralConversionUnit, and,
f(valueRU, valueCU) is a mathematical expression that includes valueRU and valueCU.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'GeneralConversionUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
LinearConversionUnit
1
A LinearConversionUnit is a ConversionBasedUnit that represents a measurement unit that is defined with respect to another
measurement reference unit through a linear conversion relationship with a conversion factor.
The unit conversion relationship is defined by the following equation:
valueRU = factor · valueCU,
where:
valueRU is the quantity value expressed in the referenceUnit, and,
valueCU is the quantity value expressed in the LinearConversionUnit.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'LinearConversionUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
Prefix
1
1
1
A Prefix represents a named multiple or submultiple multiplication factor used in the specification of a PrefixedUnit. A
SystemOfUnits may specify a set of prefixes.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'Prefix' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
PrefixedUnit
1
A Prefix represents a named multiple or submultiple multiplication factor used in the specification of a PrefixedUnit. A
SystemOfUnits may specify a set of prefixes.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'Prefix' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
SimpleUnit
A SimpleUnit is a Unit that represents a measurement unit that does not depend on any other Unit. Typically a base unit would
be specified as a SimpleUnit.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'SimpleUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
Unit
1
1
1
1
1
A Unit is an abstract classifier that represents the [VIM] concept of “measurement unit” that is defined as “real scalar quantity,
defined and adopted by convention, with which any other quantity of the same kind can be compared to express the ratio of the
two quantities as a number.”
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'Unit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
UnitFactor
1
1
A UnitFactor represents a factor in the product of powers that defines a DerivedUnit.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'UnitFactor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
unit factor
Rational number that specifies the factor in the unit conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'factor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
prefix
Ordered set of Prefix that specifies the prefixes for multiples and submultiples of units in the system
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'prefix' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
referenceUnit
Specifies the unit with respect to which the ConversionBasedUnit is defined.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'referenceUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
unit
Specification of the associated Unit.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
skos:exactMatch 'quantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
unitKind
Specification of the associated Unit "Kind".
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Unit
Scale
1
A Scale represents the [VIM] concept of a “measurement scale” that is defined as an “ordered set of quantity values of
quantities of a given kind of quantity used in ranking, according to magnitude, quantities of that kind.” A Scale specifies one
or more fixed values that have a specific significance in the definition of the associating QuantityKind.
For example the “thermodynamic temperature” kind of quantity is defined by specifying the values of 0 and 273.16 kelvin as
the temperatures of absolute zero and the triple point of water respectively.
A Scale does not always need to specify a unit. For example the “Rockwell C Hardness Scale” or the “Beaufort Wind Force
Scale” are ordinal scales that do not have a particular associated unit. Similarly, subjective scales for a “priority” or “risk” kind
of quantity with e.g. value definitions 0 for “low”, 1 for “medium” and 3 for “high” do not have a particular associated unit.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Scale
skos:exactMatch 'Scale' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
ScaleValueDefinition
1
1
A ScaleValueDefinition represents a specific value for a measurement scale.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Scale
skos:exactMatch 'ScaleValueDefinition' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
scale
Specification of a Scale that is associated to the QuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Scale
skos:exactMatch 'scale' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
scaleValueDefinition
Ordered set of ScaleValueDefinition that specifies the defined numerical value(s) and textual definition(s) for the measurement scale.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Scale
skos:exactMatch 'valueDefinition' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
DerivedQuantityKind
A DerivedQuantityKind is a QuantityKind that represents a kind of quantity that is defined as a product of powers of one or
more other kinds of quantity. A DerivedQuantityKind may also be used to define a synonym kind of quantity for another kind
of quantity.
For example “velocity” can be specified as the product of “length” to the power one times “time” to the power minus one, and
subsequently “speed” can be specified as “velocity” to the power one.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'DerivedQuantityKind ' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
PropertyKind
A PropertyKind is a meta-property which helps to characterise categories of properties e.g. scalar, vector
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
QuantityKind
1
1
1
1
1
A QuantityKind is an abstract classifier that represents the [VIM] concept of “kind of quantity” that is defined as “aspect
common to mutually comparable quantities.” A QuantityKind represents the essence of a quantity without any numerical
value or unit. Quantities of the same kind within a given system of quantities have the same quantity dimension. However,
quantities of the same dimension are not necessarily of the same kind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'QuantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
QuantityKindFactor
1
1
A QuantityKindFactor represents a factor in the product of powers that defines a DerivedQuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'QuantityKindFactor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
propertyType
Specification of the associated ProeprtyType.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
factorQuantityKind
Specification of the associated QuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'quantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
SimpleQuantityKind
A SimpleQuantityKind is a QuantityKind that represents a kind of quantity that does not depend on any other QuantityKind.
Typically a base quantity would be specified as a SimpleQuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'SimpleQuantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
SpecializedQuantityKind
1
A SpecializedQuantityKind is a QuantityKind that represents a kind of quantity that is a specialization of another kind of
quantity.
For example, “distance”, “width”, “depth”, “radius” and “wavelength” can all be specified as specializations of the “length”
SimpleQuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'SpecializedQuantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
dimension
Derived ordered set of Dimension. The actual dimension of a QuantityKind depends on the list of baseQuantityKind that are specified in an actual SystemOfQuantities, see the DerivedDimensions constraint.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'dimension' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
generalQuantityKind
A generalization relationship between two kinds of quantities.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'general' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
skos:exactMatch 'generalization' [QUDT] http:qudt.org
quantityKind
Specification of the associated QuantityKind.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'quantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
quantity kind factor
Rational number that specifies the factor in the quantity conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'factor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
specificQuantityKind
A specialization relationship between two kinds of quantities.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Quantity
skos:exactMatch 'specific' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
Dimension
1
A Dimension represents the [VIM] concept of 'quantity dimension' that is defined as 'expression of the dependence of a quantity on the base quantities of a system of quantities as a product of powers of factors corresponding to the base quantities, omitting any numerical factor.'
For example in the ISQ the quantity dimension of 'force' is denoted by dim F = L�M�T^2, where 'F' is the symbol for 'force', and 'L', 'M', 'T' are the symbols for the ISQ base quantities 'length', 'mass' and 'time' respectively.
The Dimension of any QuantityKind can be derived through the algorithm that is defined in C.5.3.20 with SystemOfQuantities. The actual Dimension for a given QuantityKind depends on the choice of baseQuantityKind specified in a SystemOfQuantities.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'Dimension' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
DimensionFactor
1
A DimensionFactor represents a factor in the product of powers that defines a Dimension.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'DimensionFactor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
SystemOfQuantities
1
1
1
1
A SystemOfQuantities represents the [VIM] concept of 'system of quantities' that is defined as a 'set of quantities together with a set of non-contradictory equations relating those quantities'. It collects a list of QuantityKind that specifies the kinds of quantity that are known in the system.
The International System of Quantities (ISQ) is an example of a SystemOfQuantities, defined in ISO 31 and ISO/IEC 80000.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'SystemOfQuantities' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
SystemOfUnits
1
1
1
1
A SystemOfUnits represents the [VIM] concept of 'system of units' that is defined as 'set of base units and derived units, together with their multiples and submultiples, defined in accordance with given rules, for a given system of quantities'. It collects a list of Unit that are known in the system. A SysML SystemOfUnits only optionally defines multiples and submultiples.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'SystemOfUnits' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
baseDimension
A Reference to the QuantityKind that represents the base quantity dimension in the factor.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'baseDimension' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
baseQuantityKind
Ordered set of QuantityKind that specifies the base quantities of the system of quantities. This is a subset of the complete quantityKind list. The base quantities define the basis for the quantity dimension of a kind of quantity.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'baseQuantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
baseUnit
Ordered set of Unit that specifies the base units of the system of units. A “base unit” is defined in [VIM] as a “measurement unit that is adopted by convention for a base quantity,” i.e. it is the (preferred) unit in which base quantities of the associated systemOfQuantities are expressed.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'baseUnit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
dimension factor
Rational number that specifies the factor in the dimension conversion relationship.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'factor' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
quantityComponent
Quantities attached to a system.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'quantityKind' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
systemOfQuantities
Reference to the SystemOfQuantities for which the units are specified.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'systemOfQuantities' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv
unitComponent
Ordered set of Unit that specifies the units that are known in the system.
http://purl.org/NET/ssnx/qu
http://www.omgsysml.org/qudv#Dimension
skos:exactMatch 'unit' [SysML 1.2-QUDV] http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv