QUDT Schema - Version 3.4.0
type: Ontology
imports: coordinateSystems
imports: datatype
imports: dtype
imports: vaem
imports: core
has graph metadata: QUDT Schema - Version 3.4.0

Quantity Kind (abstract)
type: Class
subclass of: QUDT Concept
subclass of: Restriction
  min cardinality: 0
  on property: latex symbol
subclass of: Restriction
  all values from: Quantity Kind
  on property: organized under
subclass of: Restriction
  all values from: Quantity Kind
  on property: broader
subclass of: Restriction
  all values from: Quantity Kind
  on property: specialization of

Angle unit
type: Class
description: All units relating to specificaiton of angles.
subclass of: Dimensionless Unit

QUDT Aspect
type: Class
type: Aspect Class
description: An aspect is an abstract type class that defines properties that can be reused.

Aspect Class
type: Class
subclass of: Class

Base Dimension Magnitude
type: Class
description: A Dimension expresses a magnitude for a base quantity kind such as mass, length and time. DEPRECATED - each exponent is expressed as a property. Keep until a validation of this has been done.
informative reference: http://web.mit.edu/2.25/www/pdf/DA_unified.pdf
informative reference: https://en.wikipedia.org/wiki/Dimensional_analysis
subclass of: QUDT Concept
subclass of: Restriction
  cardinality: 1
  on property: vector magnitude
subclass of: Restriction
  min cardinality: 1
  on property: vector magnitude
subclass of: Restriction
  min cardinality: 1
  on property: has base quantity kind
subclass of: Restriction
  max cardinality: 1
  on property: vector magnitude
subclass of: Restriction
  cardinality: 1
  on property: has base quantity kind
subclass of: Restriction
  max cardinality: 1
  on property: has base quantity kind
subclass of: Restriction
  all values from: Quantity Kind
  on property: has base quantity kind
subclass of: Restriction
  all values from: float
  on property: vector magnitude

Binary Prefix
type: Class
description: A Binary Prefix is a prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2.
subclass of: Prefix

Citation
type: Class
description: Provides a simple way of making citations.
subclass of: QUDT Concept
subclass of: Restriction
  cardinality: 1
  on property: description
subclass of: Restriction
  all values from: anyURI
  on property: url
subclass of: Restriction
  min cardinality: 1
  on property: description
subclass of: Restriction
  max cardinality: 1
  on property: description
subclass of: Restriction
  max cardinality: 1
  on property: url

Comment
type: Class
subclass of: Verifiable
subclass of: Restriction
  all values from: HTML
  on property: rationale
subclass of: Restriction
  max cardinality: 1
  on property: description
subclass of: Restriction
  min cardinality: 0
  on property: rationale

QUDT Concept
type: Class
description: The root class for all QUDT concepts.
subclass of: Restriction
  max cardinality: 1
  on property: deprecated
subclass of: Restriction
  all values from: QUDT Concept
  on property: exact match
subclass of: Restriction
  all values from: boolean
  on property: deprecated
subclass of: Restriction
  all values from: string
  on property: abbreviation
subclass of: Restriction
  all values from: Rule
  on property: has rule
subclass of: Restriction
  max cardinality: 1
  on property: deprecated in version
subclass of: Restriction
  max cardinality: 1
  on property: qudt id
subclass of: Restriction
  all values from: string
  on property: qudt id
subclass of: Restriction
  all values from: string
  on property: deprecated in version
subclass of: Restriction
  max cardinality: 1
  on property: abbreviation
subclass of: Restriction
  all values from: HTML
  on property: guidance

Constant value
type: Class
description: Used to specify the values of a constant.
subclass of: Quantity value
subclass of: Restriction
  all values from: boolean
  on property: exact constant
subclass of: Restriction
  max cardinality: 1
  on property: exact constant

Contextual Unit
type: Class
subclass of: Unit
subclass of: Restriction
  all values from: Unit
  on property: broader

Counting Unit
type: Class
description: A Counting Unit is used for all units that express counts. Examples are Atomic Number, Number, Number per Year, Percent and Sample per Second.
subclass of: Dimensionless Unit

Currency Unit
type: Class
description: Currency Units have their own subclass of unit because: (a) they have additional properties such as 'country' and (b) their URIs do not conform to the same rules as other units.
subclass of: Dimensionless Unit
subclass of: Restriction
  all values from: integer
  on property: currency exponent
subclass of: Restriction
  all values from: string
  on property: currency number
subclass of: Restriction
  all values from: string
  on property: currency code

Data Item
type: Class
description: A Data Item holds a value that maybe a scalar or structured datatype. Quantity Value specifies which case applies.
subclass of: QUDT Concept

Datatype
type: Class
description: A Datatype is a definition of the type of the "value" of a data item (for example, "all integers between 0 and 10"), and the allowable operations on those values; the meaning of the data; and the way values of that type can be stored. Some types are primitive - built-in to the language, with no visible internal structure. For example "Boolean"; others are composite - constructed from one or more other types (of either kind). For example lists, arrays, structures, unions. Some languages provide strong typing, others allow implicit type conversion and/or explicit type conversion.
subclass of: QUDT Concept

Decimal Prefix
type: Class
description: A Decimal Prefix is a prefix for multiples of units that are powers of 10.
subclass of: Prefix

Derived Unit
type: Class
description: A Derived Unit is a type specification for units that are derived from other units.
dbpedia match: http://dbpedia.org/resource/Category:SI_derived_units
subclass of: Unit

Digital Currency Unit
type: Class
description: A currency-like unit for cryptographic or tokenized assets. Instances should reference an ISO 24165 Digital Token Identifier (DTI) when available.
informative reference: dtif.org
informative reference: 79891.html
subclass of: Currency Unit
subclass of: Restriction
  max cardinality: 1
  on property: currency code
subclass of: Restriction
  max cardinality: 1
  on property: currency exponent
subclass of: Restriction
  all values from: string
  on property: currency code
subclass of: Restriction
  max cardinality: 1
  on property: has DTI code
subclass of: Restriction
  all values from: integer
  on property: currency exponent
subclass of: Restriction
  all values from: string
  on property: blockchain network
subclass of: Restriction
  all values from: string
  on property: has DTI code
subclass of: Restriction
  max cardinality: 1
  on property: blockchain network

Dimensionless Unit
type: Class
description: A Dimensionless Unit is a quantity for which all the exponents of the factors corresponding to the base quantities in its quantity dimension are zero.
subclass of: Unit

Discipline
type: Class
subclass of: QUDT Concept

Enumerated Quantity
type: Class
subclass of: QUDT Concept
subclass of: Restriction
  max cardinality: 1
  on property: enumeration
subclass of: Restriction
  max cardinality: 1
  on property: enumerated value
subclass of: Restriction
  all values from: Enumeration
  on property: enumeration
subclass of: Restriction
  all values from: Enumerated Value
  on property: enumerated value

Enumerated Value
type: Class
description: An Enumerated Value class defines the members of an enumeration. An enumeration is a set of literals from which a single value is selected. Each literal can have a tag as an integer within a standard encoding appropriate to the range of integer values. Consistency of enumeration types will allow them, and the enumerated values, to be referred to unambiguously either through symbolic name or encoding. Enumerated values are also controlled vocabularies and as such need to be standardized. Without this consistency enumeration literals can be stated differently and result in data conflicts and misinterpretations. The tags are a set of positive whole numbers, not necessarily contiguous and having no numerical significance, each corresponding to the associated literal identifier. An order attribute can also be given on the enumeration elements. An enumeration can itself be a member of an enumeration. This allows enumerations to be enumerated in a selection. Enumerations are also subclasses of Scalar Datatype. This allows them to be used as the reference of a datatype specification.
informative reference: https://en.wikipedia.org/wiki/Enumeration
subclass of: EnumeratedValue
subclass of: Verifiable
subclass of: Restriction
  all values from: string
  on property: abbreviation
subclass of: Restriction
  max cardinality: 1
  on property: abbreviation
subclass of: Restriction
  max cardinality: 1
  on property: description

Enumeration
type: Class
description: An Enumeration is a set of literals from which a single value is selected. Each literal can have a tag as an integer within a standard encoding appropriate to the range of integer values. Consistency of enumeration types will allow them, and the enumerated values, to be referred to unambiguously either through symbolic name or encoding. Enumerated values are also controlled vocabularies and as such need to be standardized. Without this consistency enumeration literals can be stated differently and result in data conflicts and misinterpretations. The tags are a set of positive whole numbers, not necessarily contiguous and having no numerical significance, each corresponding to the associated literal identifier. An order attribute can also be given on the enumeration elements. An enumeration can itself be a member of an enumeration. This allows enumerations to be enumerated in a selection. Enumerations are also subclasses of Scalar Datatype. This allows them to be used as the reference of a datatype specification.
dbpedia match: http://dbpedia.org/resource/Enumeration
informative reference: https://en.wikipedia.org/wiki/Enumerated_type
informative reference: https://en.wikipedia.org/wiki/Enumeration
subclass of: QUDT Concept
subclass of: Restriction
  all values from: Enumerated Value
  on property: default
subclass of: Restriction
  min cardinality: 1
  on property: element
subclass of: Restriction
  all values from: string
  on property: abbreviation
subclass of: Restriction
  max cardinality: 1
  on property: abbreviation
subclass of: Restriction
  max cardinality: 1
  on property: default
subclass of: Restriction
  all values from: Enumerated Value
  on property: element

Factor Unit
type: Class
description: A Factor Unit is a type specification for a unit, exponent pair that is a component of a derived unit.
dbpedia match: http://dbpedia.org/resource/Category:SI_derived_units
subclass of: QUDT Concept
subclass of: Restriction
  max cardinality: 1
  on property: has unit
subclass of: Restriction
  cardinality: 1
  on property: has unit
subclass of: Restriction
  min cardinality: 1
  on property: has unit

Figure
type: Class
subclass of: QUDT Concept
subclass of: Restriction
  max cardinality: 1
  on property: width
subclass of: Restriction
  min cardinality: 1
  on property: image location
subclass of: Restriction
  max cardinality: 1
  on property: height
subclass of: Restriction
  max cardinality: 1
  on property: figure caption
subclass of: Restriction
  all values from: boolean
  on property: landscape
subclass of: Restriction
  max cardinality: 1
  on property: image
subclass of: Restriction
  all values from: anyURI
  on property: image
subclass of: Restriction
  max cardinality: 1
  on property: image location
subclass of: Restriction
  all values from: string
  on property: figure caption
subclass of: Restriction
  max cardinality: 1
  on property: figure label
subclass of: Restriction
  all values from: anyURI
  on property: image location
subclass of: Restriction
  cardinality: 1
  on property: image location
subclass of: Restriction
  all values from: string
  on property: figure label
subclass of: Restriction
  all values from: string
  on property: width
subclass of: Restriction
  all values from: string
  on property: height
subclass of: Restriction
  max cardinality: 1
  on property: landscape

Interval scale
type: Class
description: The interval type allows for the degree of difference between items, but not the ratio between them. Examples include temperature with the Celsius scale, which has two defined points (the freezing and boiling point of water at specific conditions) and then separated into 100 intervals, date when measured from an arbitrary epoch (such as AD), percentage such as a percentage return on a stock, location in Cartesian coordinates, and direction measured in degrees from true or magnetic north. Ratios are not meaningful since 20 °C cannot be said to be "twice as hot" as 10 °C, nor can multiplication/division be carried out between any two dates directly. However, ratios of differences can be expressed; for example, one difference can be twice another. Interval type variables are sometimes also called "scaled variables", but the formal mathematical term is an affine space (in this case an affine line). Characteristics: median, percentile & Monotonic increasing (order (<) & totally ordered set.
informative reference: https://en.wikipedia.org/wiki/Level_of_measurement
subclass of: Scale

Latex String
type: Class
type: Datatype
description: A type of string in which some characters may be wrapped with '$' and '$ characters for LaTeX rendering.
subclass of: string

Logarithmic Unit
type: Class
description: Logarithmic units are abstract mathematical units that can be used to express any quantities (physical or mathematical) that are defined on a logarithmic scale, that is, as being proportional to the value of a logarithm function. Examples of logarithmic units include common units of information and entropy, such as the bit, and the byte, as well as units of relative signal strength magnitude such as the decibel.
subclass of: Dimensionless Unit

NIST SP~811 Comment
type: Class
description: National Institute of Standards and Technology (NIST) Special Publication 811 Comments on some quantities and their units
subclass of: Comment

Nominal scale
type: Class
description: A nominal scale differentiates between items or subjects based only on their names or (meta-)categories and other qualitative classifications they belong to; thus dichotomous data involves the construction of classifications as well as the classification of items. Discovery of an exception to a classification can be viewed as progress. Numbers may be used to represent the variables but the numbers do not have numerical value or relationship: for example, a Globally unique identifier. Examples of these classifications include gender, nationality, ethnicity, language, genre, style, biological species, and form. In a university one could also use hall of affiliation as an example.
informative reference: https://en.wikipedia.org/wiki/Level_of_measurement
subclass of: Scale

Ordinal scale
type: Class
description: The ordinal type allows for rank order (1st, 2nd, 3rd, etc.) by which data can be sorted, but still does not allow for relative degree of difference between them. Examples include, on one hand, dichotomous data with dichotomous (or dichotomized) values such as: 'sick' vs. 'healthy' when measuring health, 'guilty' vs. 'innocent' when making judgments in courts, 'wrong/false' vs. 'right/true' when measuring truth value, and, on the other hand, non-dichotomous data consisting of a spectrum of values, such as: 'completely agree', 'mostly agree', 'mostly disagree', 'completely disagree' when measuring opinion.
informative reference: https://en.wikipedia.org/wiki/Level_of_measurement
subclass of: Scale
subclass of: Restriction
  max cardinality: 1
  on property: order
subclass of: Restriction
  cardinality: 1
  on property: order
subclass of: Restriction
  min cardinality: 1
  on property: order
subclass of: Restriction
  all values from: nonNegativeInteger
  on property: order

Organization
type: Class
subclass of: QUDT Concept
subclass of: Restriction
  min cardinality: 0
  on property: url
subclass of: Restriction
  all values from: anyURI
  on property: url

Physical Constant
type: Class
description: A Physical constant is a physical quantity that is generally believed to be both universal in nature and constant in time. It can be contrasted with a mathematical constant, which is a fixed numerical value but does not directly involve any physical measurement. There are many physical constants in science, some of the most widely recognized being: the speed of light in vacuum c, Newton's gravitational constant G, Planck's constant h, the electric permittivity of free space ε0, and the elementary charge e. Physical constants can take many dimensional forms, or may be dimensionless depending on the system of quantities and units used.
dbpedia match: http://dbpedia.org/resource/Physical_constant
subclass of: Quantity
subclass of: Restriction
  all values from: Unit
  on property: applicable unit
subclass of: Restriction
  max cardinality: 1
  on property: mathML definition
subclass of: Restriction
  min cardinality: 0
  on property: dbpedia match
subclass of: Restriction
  all values from: boolean
  on property: exact constant
subclass of: Restriction
  all values from: string
  on property: mathML definition
subclass of: Restriction
  max cardinality: 1
  on property: latex definition
subclass of: Restriction
  all values from: string
  on property: ECLASS code
subclass of: Restriction
  all values from: anyURI
  on property: normative reference (ISO)
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: has dimension vector
subclass of: Restriction
  all values from: anyURI
  on property: normative reference
subclass of: Restriction
  min cardinality: 0
  on property: latex symbol
subclass of: Restriction
  all values from: System of Units
  on property: applicable system
subclass of: Restriction
  min cardinality: 0
  on property: ECLASS code
subclass of: Restriction
  all values from: string
  on property: IEC 61360 code
subclass of: Restriction
  all values from: anyURI
  on property: dbpedia match
subclass of: Restriction
  min cardinality: 0
  on property: IEC 61360 code

Plane Angle Unit
type: Class
subclass of: Angle unit

Prefix
type: Class
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  max cardinality: 1
  on property: prefix multiplier
subclass of: Restriction
  min cardinality: 0
  on property: latex symbol
subclass of: Restriction
  all values from: string
  on property: ucum code
subclass of: Restriction
  max cardinality: 1
  on property: prefix multiplier scientific
subclass of: Restriction
  all values from: decimal
  on property: prefix multiplier
subclass of: Restriction
  all values from: double
  on property: prefix multiplier scientific

Quantifiable
type: Class
description: Quantifiable is an aspect class that affords to an entity properties for being measurable, observable, or countable.
subclass of: QUDT Aspect
subclass of: Restriction
  max cardinality: 1
  on property: relative standard uncertainty
subclass of: Restriction
  all values from: decimal
  on property: standard uncertainty
subclass of: Restriction
  max cardinality: 1
  on property: standard uncertainty
subclass of: Restriction
  all values from: double
  on property: relative standard uncertainty
subclass of: Restriction
  max cardinality: 1
  on property: datatype
subclass of: Restriction
  max cardinality: 1
  on property: standard uncertainty scientific
subclass of: Restriction
  all values from: Unit
  on property: has unit
subclass of: Restriction
  all values from: double
  on property: standard uncertainty scientific
subclass of: Restriction
  max cardinality: 1
  on property: has unit

Quantity
type: Class
description: A Quantity is the measurement of an observable property of a particular object, event, or physical system. A quantity is always associated with the context of measurement (i.e. the thing measured, the measured value, the accuracy of measurement, etc.) whereas the underlying quantity kind is independent of any particular measurement. Thus, length is a quantity kind while the height of a rocket is a specific quantity of length; its magnitude that may be expressed in meters, feet, inches, etc. Examples of physical quantities include physical constants, such as the speed of light in a vacuum, Planck's constant, the electric permittivity of free space, and the fine structure constant. In other words, quantities are quantifiable aspects of the world, such as the duration of a movie, the distance between two points, velocity of a car, the pressure of the atmosphere, and a person's weight; and units are used to describe their numerical measure. Many quantity kinds are related to each other by various physical laws, and as a result, the associated units of some quantity kinds can be expressed as products (or ratios) of powers of other quantity kinds (e.g., momentum is mass times velocity and velocity is defined as distance divided by time). In this way, some quantities can be calculated from other measured quantities using their associations to the quantity kinds in these expressions. These quantity kind relationships are also discussed in dimensional analysis. Those that cannot be so expressed can be regarded as "fundamental" in this sense. A quantity is distinguished from a "quantity kind" in that the former carries a value and the latter is a type specifier.
dbpedia match: http://dbpedia.org/resource/Quantity
subclass of: QUDT Concept
subclass of: Quantifiable
subclass of: Verifiable
subclass of: Restriction
  min cardinality: 0
  on property: has quantity kind
subclass of: Restriction
  all values from: Quantity Kind
  on property: has quantity kind
subclass of: Restriction
  all values from: boolean
  on property: is Delta Quantity
subclass of: Restriction
  all values from: Quantity value
  on property: quantity value

Quantity Kind
type: Class
description: A Quantity Kind is any observable property that can be measured and quantified numerically. Familiar examples include physical properties such as length, mass, time, force, energy, power, electric charge, etc. Less familiar examples include currency, interest rate, price to earning ratio, and information capacity.
informative reference: http://www.electropedia.org/iev/iev.nsf/display
subclass of: Quantity Kind (abstract)
subclass of: Verifiable
subclass of: Restriction
  min cardinality: 0
  on property: applicable ISO unit
subclass of: Restriction
  all values from: Unit
  on property: applicable unit
subclass of: Restriction
  cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  all values from: string
  on property: IEC 61360 code
subclass of: Restriction
  all values from: Quantity Kind Dimension vector (SI)
  on property: dimension vector for SI
subclass of: Restriction
  max cardinality: 1
  on property: base ISO unit dimensions
subclass of: Restriction
  all values from: Unit
  on property: applicable ISO unit
subclass of: Restriction
  all values from: Unit
  on property: applicable Imperial unit
subclass of: Restriction
  min cardinality: 0
  on property: applicable CGS unit
subclass of: Restriction
  max cardinality: 1
  on property: base CGS unit dimensions
subclass of: Restriction
  min cardinality: 0
  on property: applicable unit
subclass of: Restriction
  max cardinality: 1
  on property: base US customary unit dimensions
subclass of: Restriction
  max cardinality: 1
  on property: base SI unit dimensions
subclass of: Restriction
  min cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  all values from: string
  on property: mathML definition
subclass of: Restriction
  max cardinality: 1
  on property: latex definition
subclass of: Restriction
  max cardinality: 1
  on property: mathML definition
subclass of: Restriction
  min cardinality: 0
  on property: applicable US Customary unit
subclass of: Restriction
  min cardinality: 0
  on property: applicable SI unit
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: numerator dimension vector
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: denominator dimension vector
subclass of: Restriction
  max cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  max cardinality: 1
  on property: numerator dimension vector
subclass of: Restriction
  min cardinality: 0
  on property: applicable Imperial unit
subclass of: Restriction
  all values from: string
  on property: ECLASS code
subclass of: Restriction
  all values from: System of Quantity Kinds
  on property: belongs to system of quantities
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: has dimension vector
subclass of: Restriction
  all values from: Unit
  on property: applicable CGS unit
subclass of: Restriction
  max cardinality: 1
  on property: denominator dimension vector
subclass of: Restriction
  all values from: Unit
  on property: applicable US Customary unit
subclass of: Restriction
  max cardinality: 1
  on property: dimension vector for SI
subclass of: Restriction
  max cardinality: 1
  on property: base imperial unit dimensions
subclass of: Restriction
  all values from: Unit
  on property: applicable SI unit

Quantity Kind Dimension Vector
type: Class
description: $\text{Quantity Kind Dimension Vector}$ describes the dimensionality of a quantity kind in the context of a system of units. In the SI system of units, the dimensions of a quantity kind are expressed as a product of the basic physical dimensions mass ($M$), length ($L$), time ($T$) current ($I$), amount of substance ($N$), luminous intensity ($J$) and absolute temperature ($\theta$) as $dim \, Q = L^{\alpha} \, M^{\beta} \, T^{\gamma} \, I ^{\delta} \, \theta ^{\epsilon} \, N^{\eta} \, J ^{\nu}$. The rational powers of the dimensional exponents, $\alpha, \, \beta, \, \gamma, \, \delta, \, \epsilon, \, \eta, \, \nu$, are positive, negative, or zero. For example, the dimension of the physical quantity kind $\it{speed}$ is $\boxed{length/time}$, $L/T$ or $LT^{-1}$, and the dimension of the physical quantity kind force is $\boxed{mass \times acceleration}$ or $\boxed{mass \times (length/time)/time}$, $ML/T^2$ or $MLT^{-2}$ respectively.
informative reference: http://web.mit.edu/2.25/www/pdf/DA_unified.pdf
informative reference: https://en.wikipedia.org/wiki/Dimensional_analysis
subclass of: QUDT Concept
subclass of: Restriction
  max cardinality: 1
  on property: dimension exponent for electric current
subclass of: Restriction
  all values from: integer
  on property: dimension exponent for electric current
subclass of: Restriction
  cardinality: 1
  on property: dimension exponent for electric current
subclass of: Restriction
  min cardinality: 0
  on property: latex symbol
subclass of: Restriction
  max cardinality: 1
  on property: latex definition
subclass of: Restriction
  all values from: Quantity Kind
  on property: has reference quantity kind
subclass of: Restriction
  min cardinality: 1
  on property: dimension exponent for electric current

CGS Dimension vector
type: Class
description: A CGS Dimension Vector is used to specify the dimensions for a C.G.S. quantity kind.
subclass of: Quantity Kind Dimension Vector

CGS EMU Dimension vector
type: Class
description: A CGS EMU Dimension Vector is used to specify the dimensions for EMU C.G.S. quantity kind.
subclass of: CGS Dimension vector

CGS ESU Dimension vector
type: Class
description: A CGS ESU Dimension Vector is used to specify the dimensions for ESU C.G.S. quantity kind.
subclass of: CGS Dimension vector

CGS GAUSS Dimension vector
type: Class
description: A CGS GAUSS Dimension Vector is used to specify the dimensions for Gaussioan C.G.S. quantity kind.
subclass of: CGS Dimension vector

CGS LH Dimension vector
type: Class
description: A CGS LH Dimension Vector is used to specify the dimensions for Lorentz-Heaviside C.G.S. quantity kind.
subclass of: CGS Dimension vector

ISO Dimension vector
type: Class
subclass of: Quantity Kind Dimension Vector

Imperial dimension vector
type: Class
subclass of: Quantity Kind Dimension Vector

Quantity Kind Dimension vector (SI)
type: Class
subclass of: Quantity Kind Dimension Vector

Quantity type
type: Class
description: A $\textit{Quantity Type}$ is an enumeration of quantity kinds. It specializes $\boxed{dtype:EnumeratedValue}$ by constrinaing $\boxed{dtype:value}$ to instances of $\boxed{qudt:QuantityKind}$.
subclass of: Enumerated Value
subclass of: Restriction
  all values from: Quantity Kind
  on property: value

Quantity value
type: Class
description: A Quantity Value
subclass of: QUDT Concept
subclass of: Quantifiable
subclass of: Verifiable

Ratio scale
type: Class
description: A Ratio Scale possesses a meaningful (unique and non-arbitrary) zero value. Most measurement in the physical sciences and engineering is done on ratio scales. Examples include mass, length, duration, plane angle, energy and electric charge. In contrast to interval scales, ratios are now meaningful because having a non-arbitrary zero point makes it meaningful to say, for example, that one object has "twice the length" of another (= is "twice as long"). Very informally, many ratio scales can be described as specifying "how much" of something (i.e. an amount or magnitude) or "how many" (a count). The Kelvin temperature scale is a ratio scale because it has a unique, non-arbitrary zero point called absolute zero.
informative reference: https://en.wikipedia.org/wiki/Level_of_measurement
subclass of: Scale

Rule
type: Class
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  all values from: Rule Type
  on property: rule type
subclass of: Restriction
  all values from: HTML
  on property: rationale
subclass of: Restriction
  min cardinality: 0
  on property: rationale

Rule Type
type: Class
subclass of: Enumerated Value

Scalar Data Item
type: Class
description: A Data Item holds a value that is compliant with a specified Datatype.
subclass of: QUDT Concept
subclass of: Restriction
  all values from: Scalar Datatype
  on property: datatype
subclass of: Restriction
  max cardinality: 1
  on property: datatype

Scalar Datatype
type: Class
description: Scalar data types are those that have a single value. The permissible values are defined over a domain that may be integers, float, character or boolean. Often a scalar data type is referred to as a primitive data type.
subclass of: Datatype

Scale
type: Class
description: Scales (also called "scales of measurement" or "levels of measurement") are expressions that typically are based on scale types.
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  max cardinality: 1
  on property: data structure
subclass of: Restriction
  all values from: Transform type
  on property: permissible transformation
subclass of: Restriction
  all values from: Scale type
  on property: scale type
subclass of: Restriction
  all values from: string
  on property: data structure
subclass of: Restriction
  max cardinality: 1
  on property: scale type
subclass of: Restriction
  all values from: MathsFunctionType
  on property: permissible maths

Scale type
type: Class
description (plain text): Scales, or scales of measurement (or categorization) provide ways of quantifying measurements, values and other enumerated values according to a normative frame of reference. Four different types of scales are typically used. These are interval, nominal, ordinal and ratio scales.
subclass of: Enumerated Value
subclass of: Restriction
  all values from: Transform type
  on property: permissible transformation
subclass of: Restriction
  max cardinality: 1
  on property: data structure
subclass of: Restriction
  all values from: MathsFunctionType
  on property: permissible maths
subclass of: Restriction
  all values from: string
  on property: data structure

Solid Angle Unit
type: Class
description: The solid angle subtended by a surface S is defined as the surface area of a unit sphere covered by the surface S's projection onto the sphere. A solid angle is related to the surface of a sphere in the same way an ordinary angle is related to the circumference of a circle. Since the total surface area of the unit sphere is 4*pi, the measure of solid angle will always be between 0 and 4*pi.
subclass of: Angle unit

Statement
type: Class
subclass of: Statement

Symbol
type: Class
subclass of: QUDT Concept

Symmetric relation
type: Class
comment: A `SymmetricRelation` is modeling construct used to define symmetric behavior for appropriate relations.
subclass of: Property

System of Quantity Kinds
type: Class
description: A System of Quantity Kinds is a set of one or more quantity kinds together with a set of zero or more algebraic equations that define relationships between quantity kinds in the set. In the physical sciences, the equations relating quantity kinds are typically physical laws and definitional relations, and constants of proportionality. Examples include Newton's First Law of Motion, Coulomb's Law, and the definition of velocity as the instantaneous change in position. In almost all cases, the system identifies a subset of base quantity kinds. The base set is chosen so that all other quantity kinds of interest can be derived from the base quantity kinds and the algebraic equations. If the unit system is explicitly associated with a quantity kind system, then the unit system must define at least one unit for each quantity kind. From a scientific point of view, the division of quantities into base quantities and derived quantities is a matter of convention.
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  all values from: Quantity Kind
  on property: system derived quantity kind
subclass of: Restriction
  all values from: System of Units
  on property: has unit system
subclass of: Restriction
  all values from: Enumeration
  on property: base dimension enumeration
subclass of: Restriction
  all values from: Quantity Kind
  on property: has quantity kind
subclass of: Restriction
  min cardinality: 0
  on property: has base quantity kind
subclass of: Restriction
  min cardinality: 0
  on property: has quantity kind
subclass of: Restriction
  all values from: Quantity Kind
  on property: has base quantity kind
subclass of: Restriction
  max cardinality: 1
  on property: has unit system
subclass of: Restriction
  max cardinality: 1
  on property: base dimension enumeration
subclass of: Restriction
  min cardinality: 0
  on property: system derived quantity kind

System of Units
type: Class
description: A System of Units is a set of units which are chosen as the reference scales for some set of quantity kinds together with the definitions of each unit. Units may be defined by experimental observation or by proportion to another unit not included in the system. If the unit system is explicitly associated with a quantity kind system, then the unit system must define at least one unit for each quantity kind.
informative reference: http://dbpedia.org/resource/Category:Systems_of_units
informative reference: http://www.ieeeghn.org/wiki/index.php/System_of_Measurement_Units
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  all values from: Unit
  on property: derived coherent unit
subclass of: Restriction
  all values from: Physical Constant
  on property: applicable physical constant
subclass of: Restriction
  all values from: Unit
  on property: has unit
subclass of: Restriction
  all values from: Unit
  on property: coherent unit
subclass of: Restriction
  all values from: Prefix
  on property: prefix
subclass of: Restriction
  all values from: Unit
  on property: defined unit
subclass of: Restriction
  all values from: Unit
  on property: base unit
subclass of: Restriction
  all values from: Unit
  on property: allowed unit
subclass of: Restriction
  all values from: Unit
  on property: derived unit

Transform type
type: Class
subclass of: Enumerated Value

case-sensitive UCUM code
type: Class
type: Datatype
description: Lexical pattern for the case-sensitive version of UCUM code
source: ucum.html
subclass of: string

Unit
type: Class
description: A unit of measure, or unit, is a particular quantity value that has been chosen as a scale for measuring other quantities the same kind (more generally of equivalent dimension). For example, the meter is a quantity of length that has been rigorously defined and standardized by the BIPM (International Board of Weights and Measures). Any measurement of the length can be expressed as a number multiplied by the unit meter. More formally, the value of a physical quantity Q with respect to a unit (U) is expressed as the scalar multiple of a real number (n) and U, as $Q = nU$.
informative reference: http://dbpedia.org/resource/Category:Units_of_measure
informative reference: http://www.allmeasures.com/Fullconversion.asp
subclass of: QUDT Concept
subclass of: Verifiable
subclass of: Restriction
  max cardinality: 1
  on property: ucum code
subclass of: Restriction
  all values from: Quantity Kind
  on property: has quantity kind
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: has dimension vector
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: denominator dimension vector
subclass of: Restriction
  all values from: decimal
  on property: conversion multiplier
subclass of: Restriction
  all values from: System of Units
  on property: defined unit of system
subclass of: Restriction
  min cardinality: 1
  on property: has quantity kind
subclass of: Restriction
  max cardinality: 1
  on property: numerator dimension vector
subclass of: Restriction
  all values from: decimal
  on property: factorUnitScalar
subclass of: Restriction
  max cardinality: 1
  on property: conversion offset
subclass of: Restriction
  all values from: string
  on property: udunits code
subclass of: Restriction
  max cardinality: 1
  on property: denominator dimension vector
subclass of: Restriction
  all values from: string
  on property: si units expression
subclass of: Restriction
  max cardinality: 1
  on property: mathML definition
subclass of: Restriction
  max cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  all values from: System of Units
  on property: is derived unit of system
subclass of: Restriction
  all values from: Unit
  on property: scalingOf
subclass of: Restriction
  max cardinality: 1
  on property: factorUnitScalar
subclass of: Restriction
  all values from: System of Units
  on property: is unit of system
subclass of: Restriction
  all values from: double
  on property: conversion multiplier scientific
subclass of: Restriction
  max cardinality: 1
  on property: conversion multiplier
subclass of: Restriction
  all values from: Prefix
  on property: prefix
subclass of: Restriction
  max cardinality: 1
  on property: prefix
subclass of: Restriction
  all values from: System of Units
  on property: is coherent derived unit of system
subclass of: Restriction
  all values from: Quantity Kind
  on property: unit for quantity kind
subclass of: Restriction
  all values from: Unit
  on property: has reciprocal unit
subclass of: Restriction
  all values from: double
  on property: conversion offset scientific
subclass of: Restriction
  min cardinality: 0
  on property: si units expression
subclass of: Restriction
  max cardinality: 1
  on property: conversion offset scientific
subclass of: Restriction
  max cardinality: 1
  on property: scalingOf
subclass of: Restriction
  all values from: string
  on property: IEC 61360 code
subclass of: Restriction
  all values from: System of Units
  on property: applicable system
subclass of: Restriction
  all values from: Quantity Kind Dimension Vector
  on property: numerator dimension vector
subclass of: Restriction
  all values from: string
  on property: ECLASS code
subclass of: Restriction
  max cardinality: 1
  on property: conversion multiplier scientific
subclass of: Restriction
  min cardinality: 0
  on property: latex definition
subclass of: Restriction
  min cardinality: 0
  on property: latex symbol
subclass of: Restriction
  all values from: decimal
  on property: conversion offset
subclass of: Restriction
  cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  min cardinality: 1
  on property: has dimension vector
subclass of: Restriction
  all values from: Quantity Kind
  on property: categorized by quantity kind
subclass of: Restriction
  all values from: string
  on property: unece common code
subclass of: Restriction
  all values from: string
  on property: mathML definition

User Quantity Kind
type: Class
subclass of: Quantity Kind (abstract)
subclass of: Restriction
  min cardinality: 1
  on property: has quantity kind
subclass of: Restriction
  max cardinality: 1
  on property: has quantity kind
subclass of: Restriction
  cardinality: 1
  on property: has quantity kind
subclass of: Restriction
  all values from: Quantity Kind
  on property: has quantity kind

Verifiable
type: Class
type: Aspect Class
description: An aspect class that holds properties that provide external knowledge and specifications of a given resource.
subclass of: QUDT Aspect

value
type: Property
description: A property to relate an observable thing with a value expressed as a decimal

applicable CGS unit
type: ObjectProperty
range: Unit
sub property of: applicable unit

applicable ISO unit
type: ObjectProperty
range: Unit
sub property of: applicable unit

applicable Imperial unit
type: ObjectProperty
range: Unit
sub property of: applicable unit

applicable physical constant
type: ObjectProperty
range: Physical Constant

applicable SI unit
type: ObjectProperty
range: Unit
sub property of: applicable unit

applicable system
type: ObjectProperty
description: This property relates a unit of measure with a unit system that may or may not define the unit, but within which the unit is compatible.
range: System of Units

applicable US Customary unit
type: ObjectProperty
range: Unit
sub property of: applicable unit

applicable unit
type: ObjectProperty
description: See this page on the QUDT GitHubWiki on how "qudt:applicableUnit" is computed from "qudt:hasQuantityKind" and then materialized.
range: Unit

base dimension enumeration
type: ObjectProperty
type: FunctionalProperty
description: This property associates a system of quantities with an enumeration that enumerates the base dimensions of the system in canonical order.
range: Enumeration

is base unit of system
type: ObjectProperty
description: This property relates a unit of measure to the system of units in which it is defined as a base unit for the system. The base units of a system are used to define the derived units of the system by expressing the derived units as products of the base units raised to a rational power.
inverse of: base unit
sub property of: defined unit of system

belongs to system of quantities
type: ObjectProperty
range: System of Quantity Kinds

categorized by quantity kind
type: ObjectProperty
description: Relates a unit to a non-commensurate quantity-kind category under which it is grouped — e.g. the placeholder quantitykind:Unknown, or a dimensionless bucket such as quantitykind:DimensionlessRatio — without asserting that the unit measures or is convertible within a commensurate family. A sub-property of qudt:hasQuantityKind. Contrast qudt:unitForQuantityKind.
range: Quantity Kind
sub property of: has quantity kind

default
type: ObjectProperty
type: FunctionalProperty
description: The default element in an enumeration
range: Enumerated Value

defined unit of system
type: ObjectProperty
description: This property relates a unit of measure with the unit system that defines the unit.
inverse of: defined unit
range: System of Units
sub property of: is unit of system

is coherent derived unit of system
type: ObjectProperty
description: This property relates a unit of measure to the unit system in which the unit is derived from the system's base units with a proportionality constant of one.
inverse of: derived coherent unit
range: System of Units
sub property of: defined unit of system
sub property of: is derived unit of system

is non-coherent derived unit of system
type: ObjectProperty
description: This property relates a unit of measure to the unit system in which the unit is derived from the system's base units without proportionality constant of one.
inverse of: has coherent derived unit
sub property of: is derived unit of system

is derived unit of system
type: ObjectProperty
description: This property relates a unit of measure to the system of units in which it is defined as a derived unit. That is, the derived unit is defined as a product of the base units for the system raised to some rational power.
inverse of: derived unit
range: System of Units
sub property of: is unit of system

dimension inverse
type: ObjectProperty
type: InverseFunctionalProperty
type: SymmetricProperty

dimension vector for SI
type: ObjectProperty
type: FunctionalProperty
range: Quantity Kind Dimension vector (SI)

element
type: ObjectProperty
description: An element of an enumeration
range: Enumerated Value

enumerated value
type: ObjectProperty
type: FunctionalProperty
range: Enumerated Value

exact match
type: ObjectProperty
type: Symmetric relation
range: QUDT Concept

allowed unit
type: ObjectProperty
description: This property relates a unit system with a unit of measure that is not defined by or part of the system, but is allowed for use within the system. An allowed unit must be convertible to some dimensionally eqiuvalent unit that is defined by the system.
range: Unit
sub property of: has unit

has base quantity kind
type: ObjectProperty
range: Quantity Kind
sub property of: has quantity kind

base unit
type: ObjectProperty
description: This property relates a system of units to a base unit defined within the system. The base units of a system are used to define the derived units of the system by expressing the derived units as products of the base units raised to a rational power.
inverse of: is base unit of system
range: Unit
sub property of: coherent unit

coherent unit
type: ObjectProperty
description: A coherent unit of measurement for a unit system is a defined unit that may be expressed as a product of powers of the system's base units with the proportionality factor of one.
range: Unit
sub property of: defined unit

defined unit
type: ObjectProperty
description: This property relates a unit system with a unit of measure that is defined by the system.
range: Unit
sub property of: has unit

derived coherent unit
type: ObjectProperty
inverse of: is coherent derived unit of system
range: Unit
sub property of: coherent unit
sub property of: derived unit

has coherent derived unit
type: ObjectProperty
inverse of: is non-coherent derived unit of system
sub property of: derived unit

derived unit
type: ObjectProperty
description: This property relates a system of units to a unit of measure that is defined within the system in terms of the base units for the system. That is, the derived unit is defined as a product of the base units for the system raised to some rational power.
inverse of: is derived unit of system
range: Unit

has dimension vector
type: ObjectProperty
range: Quantity Kind Dimension Vector

hasFactorUnit
type: ObjectProperty
description: This property relates a derived unit to one of its constituent factor units

has quantity kind
type: ObjectProperty
range: Quantity Kind

has reciprocal unit
type: ObjectProperty
description: Used to relate a unit to its reciprocal unit.
range: Unit

has reference quantity kind
type: ObjectProperty
range: Quantity Kind

has rule
type: ObjectProperty
range: Rule

has unit
type: ObjectProperty
description: This property relates a factor unit to its unit or system of units with a unit of measure that is either: a) defined by the system, b) accepted for use by the system and is convertible to a unit of equivalent dimension that is defined by the system, c) a reference to the unit of measure of a quantity (variable or constant) of interest. Systems of units may distinguish between base and derived units. Base units are the units which measure the base quantities for the corresponding system of quantities. The base units are used to define units for all other quantities as products of powers of the base units. Such units are called derived units for the system.
range: Unit

has unit system
type: ObjectProperty
type: FunctionalProperty
range: System of Units

is unit of system
type: ObjectProperty
description: This property relates a unit of measure with a system of units that either a) defines the unit or b) allows the unit to be used within the system.
range: System of Units

organized under
type: ObjectProperty
description: Relates a quantity kind to a broader quantity kind for the purpose of organization and unit applicability only — it does not assert commensurability. A sub-property of skos:broader (so it contributes to the concept hierarchy), but unlike qudt:specializationOf it makes no commensurability claim: qudt:organizedUnder groups quantity kinds that share a dimension but are not interchangeable — principally the dimensionless quantity kinds, which are all organised under quantitykind:Dimensionless / quantitykind:DimensionlessRatio without being commensurable with one another. qudt:organizedUnder still contributes to the concept hierarchy (via skos:broader), and the build still validates that it only links quantity kinds of the same dimension, but the applicable-unit computation traverses only qudt:specializationOf — an organizational grouping confers no units on its members. The commensurability test likewise traverses qudt:specializationOf and qudt:exactMatch (never qudt:organizedUnder).
range: Quantity Kind
sub property of: broader

permissible maths
type: ObjectProperty
range: MathsFunctionType

permissible transformation
type: ObjectProperty
range: Transform type

prefix
type: ObjectProperty
description: Associates a unit with the appropriate prefix, if any.
range: Prefix

denominator dimension vector
type: ObjectProperty
type: FunctionalProperty
range: Quantity Kind Dimension Vector

numerator dimension vector
type: ObjectProperty
type: FunctionalProperty
range: Quantity Kind Dimension Vector

quantity
type: ObjectProperty
type: FunctionalProperty
description: a property to relate an observable thing with a quantity (qud:Quantity)
range: Quantity

quantity value
type: ObjectProperty
range: Quantity value

rule type
type: ObjectProperty
range: Rule Type

scale type
type: ObjectProperty
type: FunctionalProperty
range: Scale type

scalingOf
type: ObjectProperty
type: FunctionalProperty
description: This property relates a unit that is scaled to the base unit that its qudt:conversionMultiplier converts it to
range: Unit

specialization of
type: ObjectProperty
description: Relates a quantity kind to a broader quantity kind of which it is a specialization, asserting commensurability: the two share a dimension, their values are comparable and addable, and their units are inter-convertible. A sub-property of skos:broader. Commensurability families are the connected components under (qudt:specializationOf | qudt:exactMatch). Contrast qudt:organizedUnder, which groups quantity kinds without asserting commensurability.
range: Quantity Kind
sub property of: broader

system derived quantity kind
type: ObjectProperty
range: Quantity Kind
sub property of: has quantity kind

unit for
type: ObjectProperty
inverse of: has unit
domain: Unit

unit for quantity kind
type: ObjectProperty
description: Relates a unit to a quantity kind it is a unit for — a quantity kind the unit measures, a member of the commensurate family within which the unit is convertible. A sub-property of qudt:hasQuantityKind. Contrast qudt:categorizedByQuantityKind.
range: Quantity Kind
sub property of: has quantity kind

value for quantity
type: ObjectProperty
inverse of: quantity value

description
type: DatatypeProperty

abbreviation
type: DatatypeProperty
description: An abbreviation for a unit is a short ASCII string that is used in place of the full name for the unit in contexts where non-ASCII characters would be problematic, or where using the abbreviation will enhance readability. When a power of abase unit needs to be expressed, such as squares this can be done using abbreviations rather than symbols. For example, sq ft means square foot, and cu ft means cubic foot.
range: string

base CGS unit dimensions
type: DatatypeProperty
type: FunctionalProperty

base ISO unit dimensions
type: DatatypeProperty
type: FunctionalProperty

base imperial unit dimensions
type: DatatypeProperty
type: FunctionalProperty

base SI unit dimensions
type: DatatypeProperty
type: FunctionalProperty

base US customary unit dimensions
type: DatatypeProperty
type: FunctionalProperty

blockchain network
type: DatatypeProperty
comment: Primary network name (e.g., 'Bitcoin Mainnet', 'Ethereum Mainnet').

conversion multiplier
type: DatatypeProperty
type: FunctionalProperty
range: decimal

conversion multiplier scientific
type: DatatypeProperty
type: FunctionalProperty
range: double

conversion offset
type: DatatypeProperty
type: FunctionalProperty
range: decimal

conversion offset scientific
type: DatatypeProperty
type: FunctionalProperty
range: double

currency code
type: DatatypeProperty
description: Alphabetic Currency Code as defined by ISO 4217. For example, the currency code for the US dollar is USD.
range: string

currency exponent
type: DatatypeProperty
description: The currency exponent indicates the number of decimal places between a major currency unit and its minor currency unit. For example, the US dollar is the major currency unit of the United States, and the US cent is the minor currency unit. Since one cent is 1/100 of a dollar, the US dollar has a currency exponent of 2. However, the Japanese Yen has no minor currency units, so the yen has a currency exponent of 0.
range: integer

currency number
type: DatatypeProperty
description: Three-digit Currency Code as defined by ISO 4217. For example, the currency number for the US dollar is "840".
range: string

data structure
type: DatatypeProperty
type: FunctionalProperty
range: string

dbpedia match
type: DatatypeProperty
range: anyURI

deprecated
type: DatatypeProperty
type: FunctionalProperty
range: boolean

deprecated in version
type: DatatypeProperty
type: FunctionalProperty
description: Version number of the first QUDT release in which an entity was deprecated.
range: string

dimension exponent for electric current
type: DatatypeProperty
type: FunctionalProperty
range: integer

ECLASS code
type: DatatypeProperty
description: Provides an IRDI (International Registration Data Identifier) that identifies the corresponding definition in the ECLASS Standard.
range: string

exact constant
type: DatatypeProperty
range: boolean

factorUnitScalar
type: DatatypeProperty
type: FunctionalProperty
description: For a derived unit that is not exactly the product of its factor units, this property defines the scalar with which that product has to be multiplied with.
range: decimal

figure caption
type: DatatypeProperty
type: FunctionalProperty
range: string

figure label
type: DatatypeProperty
type: FunctionalProperty
range: string

guidance
type: DatatypeProperty
range: HTML

has DTI code
type: DatatypeProperty
comment: ISO 24165 Digital Token Identifier (12-character alphanumeric).

height
type: DatatypeProperty
type: FunctionalProperty
range: string

qudt id
type: DatatypeProperty
type: FunctionalProperty
description: The "qudt:id" is an identifier string that uniquely identifies a QUDT concept. The identifier is constructed using a prefix. For example, units are coded using the pattern: "UCCCENNNN", where "CCC" is a numeric code or a category and "NNNN" is a digit string for a member element of that category. For scaled units there may be an addition field that has the format "QNN" where "NN" is a digit string representing an exponent power, and "Q" is a qualifier that indicates with the code "P" that the power is a positive decimal exponent, or the code "N" for a negative decimal exponent, or the code "B" for binary positive exponents.
range: string

IEC 61360 code
type: DatatypeProperty
description: Provides an IRDI (International Registration Data Identifier) that identifies the corresponding definition in the IEC CDD (Common Data Dictionary).
range: string

image
type: DatatypeProperty
type: FunctionalProperty
range: anyURI

image location
type: DatatypeProperty
type: FunctionalProperty
range: anyURI

is Delta Quantity
type: DatatypeProperty
description: This property is used to identify a Quantity instance that is a measure of a change, or interval, of some property, rather than a measure of its absolute value. This is important for measurements such as temperature differences where the conversion among units would be calculated differently because of offsets.
range: boolean

normative reference (ISO)
type: DatatypeProperty
description: Provides a way to reference the ISO unit definition.
range: anyURI
sub property of: normative reference

landscape
type: DatatypeProperty
type: FunctionalProperty
range: boolean

latex definition
type: DatatypeProperty

latex symbol
type: DatatypeProperty
description: The symbol is a glyph that is used to represent some concept, typically a unit or a quantity, in a compact form. For example, the symbol for an Ohm is $ohm$. This contrasts with 'unit:abbreviation', which gives a short alphanumeric abbreviation for the unit, 'ohm' for Ohm.

mathML definition
type: DatatypeProperty
type: FunctionalProperty
range: string
sub property of: math definition

normative reference
type: DatatypeProperty
description: Provides a way to reference information that is an authoritative source providing a standard definition
range: anyURI

order
type: DatatypeProperty
type: FunctionalProperty
range: nonNegativeInteger

prefix multiplier
type: DatatypeProperty
type: FunctionalProperty
range: decimal

prefix multiplier scientific
type: DatatypeProperty
type: FunctionalProperty
range: double

rationale
type: DatatypeProperty
range: HTML

relative standard uncertainty
type: DatatypeProperty
type: FunctionalProperty
description: The relative standard uncertainty of a measurement is the (absolute) standard uncertainty divided by the magnitude of the exact value.
range: double

si units expression
type: DatatypeProperty
range: string

standard uncertainty
type: DatatypeProperty
type: FunctionalProperty
description: The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements.
range: decimal

standard uncertainty scientific
type: DatatypeProperty
type: FunctionalProperty
description: The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements.
range: double

ucum code
type: DatatypeProperty
description: ucumCode associates a QUDT unit with its UCUM code (case-sensitive). In SHACL the values are derived from specific ucum properties using 'sh:values'.
source: https://ucum.org/ucum.html
range: string
sub property of: notation

udunits code
type: DatatypeProperty
description: The UDUNITS package supports units of physical quantities. Its C library provides for arithmetic manipulation of units and for conversion of numeric values between compatible units. The package contains an extensive unit database, which is in XML format and user-extendable. The package also contains a command-line utility for investigating units and converting values.
source: https://www.unidata.ucar.edu/software/udunits/
range: string

unece common code
type: DatatypeProperty
description: The UN/CEFACT Recommendation 20 provides three character alphabetic and alphanumeric codes for representing units of measurement for length, area, volume/capacity, mass (weight), time, and other quantities used in international trade. The codes are intended for use in manual and/or automated systems for the exchange of information between participants in international trade.
source: https://service.unece.org/trade/uncefact/vocabulary/rec20/
source: https://unece.org/trade/documents/2021/06/uncefact-rec20-0
range: string

url
type: DatatypeProperty
range: anyURI

vector magnitude
type: DatatypeProperty
type: FunctionalProperty
range: float

width
type: DatatypeProperty
type: FunctionalProperty
range: string

abstract
type: AnnotationProperty

contributor
type: AnnotationProperty

created
type: AnnotationProperty

creator
type: AnnotationProperty

is replaced by
type: AnnotationProperty

modified
type: AnnotationProperty

rights
type: AnnotationProperty

source
type: AnnotationProperty

subject
type: AnnotationProperty

title
type: AnnotationProperty

was derived from
type: AnnotationProperty

acronym
type: AnnotationProperty

alt symbol
type: AnnotationProperty
description: An alternative symbol
sub property of: literal

applicable Planck unit
type: AnnotationProperty
sub property of: applicable unit

categorized as
type: AnnotationProperty

coherent unit system
type: AnnotationProperty
description: A system of units is coherent with respect to a system of quantities and equations if the system of units is chosen in such a way that the equations between numerical values have exactly the same form (including the numerical factors) as the corresponding equations between the quantities. In such a coherent system, no numerical factor other than the number 1 ever occurs in the expressions for the derived units in terms of the base units. For example, the $newton$ and the $joule$. These two are, respectively, the force that causes one kilogram to be accelerated at 1 metre per (1) second per (1) second, and the work done by 1 newton acting over 1 metre. Being coherent refers to this consistent use of 1. In the old c.g.s. system , with its base units the centimetre and the gram, the corresponding coherent units were the dyne and the erg, respectively the force that causes 1 gram to be accelerated at 1 centimetre per (1) second per (1) second, and the work done by 1 dyne acting over 1 centimetre. So $1\,newton = 10^5 dyne$, $1 joule = 10^7 erg$, making each of the four compatible in a decimal sense within its respective other system, but not coherent therein.
informative reference: https://en.wikipedia.org/wiki/Coherence_(units_of_measurement)
sub property of: has unit system

denominator dimension vector
type: AnnotationProperty

dimension exponent
type: AnnotationProperty

dimension exponent for amount of substance
type: AnnotationProperty

dimension exponent for length
type: AnnotationProperty

dimension exponent for luminous intensity
type: AnnotationProperty

dimension exponent for mass
type: AnnotationProperty

dimension exponent for thermodynamic temperature
type: AnnotationProperty

dimension exponent for time
type: AnnotationProperty

dimensionless exponent
type: AnnotationProperty

example
type: AnnotationProperty
description: The 'qudt:example' property is used to annotate an instance of a class with a reference to a concept that is an example. The type of this property is 'rdf:Property'. This allows both scalar and object ranges.

exponent
type: AnnotationProperty
description: This property relates a factor unit its exponent
description (plain text): Defines the exponent of a factor unit

expression
type: AnnotationProperty
description: An 'expression' is a finite combination of symbols that are well-formed according to rules that apply to units of measure, quantity kinds and their dimensions.

field code
type: AnnotationProperty
description (plain text): A field code is a generic property for representing unique codes that make up other identifiers. For example each QuantityKind class caries a domain code as its field code.

figure
type: AnnotationProperty
description: Provides a link to an image.
range: Figure

has quantity kind dimension vector denominator part
type: AnnotationProperty

has dimension
type: AnnotationProperty

dimension expression
type: AnnotationProperty

has numerator part
type: AnnotationProperty

prefix unit
type: AnnotationProperty
sub property of: defined unit

has quantity
type: AnnotationProperty
range: Quantity

has vocabulary
type: AnnotationProperty
description (plain text): Used to relate a class to one or more graphs where vocabularies for the class are defined.

informative reference
type: AnnotationProperty
description: Provides a way to reference a source that provided useful but non-normative information.

is dimension in system
type: AnnotationProperty

is metric unit
type: AnnotationProperty

math definition
type: AnnotationProperty

numerator dimension vector
type: AnnotationProperty

numeric value
type: AnnotationProperty

om unit
type: AnnotationProperty

online reference
type: AnnotationProperty

out of scope
type: AnnotationProperty

description (plain text)
type: AnnotationProperty
description: A plain text description is used to provide a description with only simple ASCII characters for cases where LaTeX , HTML or other markup would not be appropriate.
range: Literal

reference
type: AnnotationProperty

reference unit
type: AnnotationProperty

relevant quantity kind
type: AnnotationProperty

Relevant Unit
type: AnnotationProperty
description: This property is used for qudt:Discipline instances to identify the Unit instances that are used within a given discipline.

Individual from SI Reference Point
type: AnnotationProperty

symbol
type: AnnotationProperty
description: The symbol is a glyph that is used to represent some concept, typically a unit or a quantity, in a compact form. For example, the symbol for an Ohm is $ohm$. This contrasts with 'unit:abbreviation', which gives a short alphanumeric abbreviation for the unit, 'ohm' for Ohm.
sub property of: literal

system definition
type: AnnotationProperty

system dimension
type: AnnotationProperty

value scientific
type: AnnotationProperty
description: A property to relate an observable thing with a value expressed in scientific notation

Wikidata match
type: AnnotationProperty
description: This property relates a QUDT concept to a Wikidata item. The Wikidata item is identified by the Wikidata URI, which is of the form `https://www.wikidata.org/wiki/Q{number}`.
range: anyURI

superseded by
type: AnnotationProperty

dtype
namespace: http://www.linkedmodel.org/schema/dtype#
namespace prefix: dtype

QUDT Schema - Version 3.4.0
type: GraphMetaData
contributor: Daniel Mekonnen
contributor: David Price
contributor: Jack Hodges
contributor: James E. Masters
contributor: Simon J D Cox
contributor: Steve Ray
created: 2011-04-20
description: This OWL schema is derived from the SHACL schema found at http://qudt.org/schema/shacl/qudt.
modified: 2026-06-25T12:34:17Z
rights: This product includes all or a portion of the UCUM table, UCUM codes, and UCUM definitions or is derived from it, subject to a license from Regenstrief Institute, Inc. and The UCUM Organization. Your use of the UCUM table, UCUM codes, UCUM definitions also is subject to this license, a copy of which is available at ​http://unitsofmeasure.org. The current complete UCUM table, UCUM Specification are available for download at ​http://unitsofmeasure.org. The UCUM table and UCUM codes are copyright © 1995-2009, Regenstrief Institute, Inc. and the Unified Codes for Units of Measures (UCUM) Organization. All rights reserved. THE UCUM TABLE (IN ALL FORMATS), UCUM DEFINITIONS, AND SPECIFICATION ARE PROVIDED 'AS IS.' ANY EXPRESS OR IMPLIED WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
rights: The QUDT Ontologies are issued under a Creative Commons Attribution 4.0 International License (CC BY 4.0), available at https://creativecommons.org/licenses/by/4.0/. Attribution should be made to QUDT.org
subject: QUDT
version IRI: QUDT Schema - Version 3.4.0
derived from: qudt
informative reference: http://unitsofmeasure.org/trac
informative reference: http://www.bipm.org/en/publications/si-brochure
informative reference: http://www.bipm.org/utils/common/documents/jcgm/JCGM_200_2008.pdf
informative reference: https://books.google.com/books
informative reference: https://www.nist.gov/physical-measurement-laboratory/special-publication-811
label: QUDT Schema Metadata Version 3.4.0
graph name: qudt
graph title: Quantities, Units, Dimensions and Types (QUDT) Schema - Version 3.4.0
has graph role: SchemaGraph
has owner: QUDT
has steward: QUDT
intent: Specifies the schema for quantities, units and dimensions. Types are defined in other schemas.
is metadata for: QUDT Schema - Version 3.4.0
latest published version: https://qudt.org/doc/2026/06/DOC_SCHEMA-QUDT.html
namespace: http://qudt.org/schema/qudt/
namespace prefix: qudt
owner: qudt.org
previous published version: https://qudt.org/doc/2026/05/DOC_SCHEMA-QUDT.html
turtle file URL: QUDT Schema - Version 3.4.0
uses non imported resource: abstract
uses non imported resource: contributor
uses non imported resource: created
uses non imported resource: description
uses non imported resource: modified
uses non imported resource: rights
uses non imported resource: source
uses non imported resource: subject
uses non imported resource: title
uses non imported resource: Datatype
uses non imported resource: QUDT-Attribution
with attribution to: QUDT-Attribution

QUDT
type: Party
description: QUDT is a non-profit organization that governs the QUDT ontologies.
graph name: qudt.org
website: http://www.qudt.org

QUDT Schema Catalog Entry
type: CatalogEntry