http://qudt.org/schema/qudt/Quantity
<p>A <b>Quantity</b> 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 <b>quantity kind</b> 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. </p>
<p>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.</p>
<p>Many <b>quantity kinds</b> 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.</p>
<p>A quantity is distinguished from a "quantity kind" in that the former carries a value and the latter is a type specifier.
</p>
Instances of qudt:Quantity can have the following properties:
| PROPERTY | TYPE | DESCRIPTION | RANGE |
|---|
By the associated SHACL property shapes, instances of qudt:Quantity can have the following properties:
| PROPERTY | PROPERTY TYPE | DESCRIPTION | MIN | MAX | VALUE TYPE | OTHER CONSTRAINTS | GLOBAL RANGE |
|---|---|---|---|---|---|---|---|
| qudt:Quantity | |||||||
| qudt:hasQuantityKind | rdf:Property | 0 | * | qudt:QuantityKind | -- | ||
| qudt:isDeltaQuantity | rdf:Property | 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. | 0 | * | xsd:boolean | -- | |
| qudt:quantityValue | rdf:Property | 0 | * | qudt:QuantityValue | -- | ||
| qudt:Concept | |||||||
| dcterms:description | rdf:Property | 0 | * | -- | |||
| dcterms:isReplacedBy | rdf:Property | 0 | 1 | -- | |||
dtype:code |
-- | 0 | * | -- | |||
| qudt:abbreviation | rdf:Property | <p>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, <em>sq ft</em> means <em>square foot</em>, and <em>cu ft</em> means <em>cubic foot</em>. </p> | 0 | 1 | xsd:string | -- | |
| qudt:deprecated | rdf:Property | 0 | 1 | xsd:boolean | -- | ||
| qudt:deprecatedInVersion | rdf:Property | Version number of the first QUDT release in which an entity was deprecated. | 0 | 1 | xsd:string |
sh:pattern
^\d+\.\d+\.\d+$
|
-- |
| qudt:exactMatch | owl:ObjectProperty | 0 | * | qudt:Concept | -- | ||
| qudt:guidance | rdf:Property | 0 | * | rdf:HTML | -- | ||
| qudt:hasRule | rdf:Property | 0 | * | qudt:Rule | -- | ||
| qudt:id | rdf:Property | <p>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. </p> <p>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. </p> | 0 | 1 | xsd:string | -- | |
| qudt:plainTextDescription | rdf:Property | 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. | 0 | * | -- | ||
rdf:type |
-- | 1 | * | -- | |||
| qudt:Quantifiable | |||||||
qudt:datatype |
-- | 0 | 1 |
sh:or
( qudt:Datatype | qudt:EnumeratedValue )
|
-- | ||
| qudt:hasUnit | rdf:Property | <p>This property relates a factor unit to its unit or system of units with a unit of measure that is either: </p> <dl> <dd>a) defined by the system,</dd> <dd>b) accepted for use by the system and is convertible to a unit of equivalent dimension that is defined by the system,</dd> <dd>c) a reference to the unit of measure of a quantity (variable or constant) of interest.</dd> </dl> <p>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. </p> | 0 | 1 | qudt:Unit | -- | |
| qudt:relativeStandardUncertainty | rdf:Property | The relative standard uncertainty of a measurement is the (absolute) standard uncertainty divided by the magnitude of the exact value. | 0 | 1 | xsd:double | -- | |
| qudt:standardUncertainty | rdf:Property | The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements. | 0 | 1 | xsd:decimal | -- | |
| qudt:standardUncertaintySN | rdf:Property | The standard uncertainty of a quantity is the estimated standard deviation of the mean taken from a series of measurements. | 0 | 1 | xsd:double | -- | |
| qudt:value | rdf:Property | A property to relate an observable thing with a value expressed as a decimal | 0 | 1 | rdf:first [sh:or qudt:NumericTypeUnion], rdf:rest (sh:property [sh:class qudt:DataItem, sh:path qudt:value], sh:property [sh:class qudt:EnumeratedValue, sh:path qudt:value]) | -- | |
| qudt:valueSN | rdf:Property | A property to relate an observable thing with a value expressed in scientific notation | 0 | 1 | -- | ||
| qudt:Verifiable | |||||||
| qudt:dbpediaMatch | rdf:Property | 0 | * | xsd:anyURI | -- | ||
| qudt:informativeReference | rdf:Property | Provides a way to reference a source that provided useful but non-normative information. | 0 | * |
sh:or
( xsd:anyURI | qudt:Citation )
|
-- | |
| qudt:isoNormativeReference | rdf:Property | Provides a way to reference the ISO unit definition. | 0 | * | xsd:anyURI | -- | |
| qudt:normativeReference | rdf:Property | Provides a way to reference information that is an authoritative source providing a standard definition | 0 | * | xsd:anyURI | -- | |
| qudt:wikidataMatch | rdf:Property | 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}`. | 0 | 1 | -- | ||
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
qudt:Quantity a rdfs:Class,
sh:NodeShape ;
rdfs:label "Quantity" ;
dcterms:description """
<p>A <b>Quantity</b> 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 <b>quantity kind</b> 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. </p>
<p>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.</p>
<p>Many <b>quantity kinds</b> 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.</p>
<p>A quantity is distinguished from a "quantity kind" in that the former carries a value and the latter is a type specifier.
</p>"""^^rdf:HTML ;
qudt:dbpediaMatch "http://dbpedia.org/resource/Quantity"^^xsd:anyURI ;
rdfs:isDefinedBy <http://qudt.org/3.5.2/schema/shacl/qudt> ;
rdfs:subClassOf qudt:Concept,
qudt:Quantifiable,
qudt:Verifiable ;
sh:property qudt:Quantity-hasQuantityKind,
qudt:Quantity-isDeltaQuantity,
qudt:Quantity-quantityValue .