http://qudt.org/schema/qudt/SystemOfQuantityKinds
<p>A <em>System of Quantity Kinds</em> 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.
</p>
<p>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.
</p>
Instances of qudt:SystemOfQuantityKinds can have the following properties:
| PROPERTY | TYPE | DESCRIPTION | RANGE |
|---|
By the associated SHACL property shapes, instances of qudt:SystemOfQuantityKinds can have the following properties:
| PROPERTY | PROPERTY TYPE | DESCRIPTION | MIN | MAX | VALUE TYPE | OTHER CONSTRAINTS | GLOBAL RANGE |
|---|---|---|---|---|---|---|---|
| qudt:SystemOfQuantityKinds | |||||||
| qudt:baseDimensionEnumeration | rdf:Property | This property associates a system of quantities with an enumeration that enumerates the base dimensions of the system in canonical order. | 0 | 1 | qudt:Enumeration | -- | |
| qudt:hasBaseQuantityKind | rdf:Property | 0 | * | qudt:QuantityKind | -- | ||
| qudt:hasQuantityKind | rdf:Property | 0 | * | qudt:QuantityKind | -- | ||
| qudt:hasUnitSystem | rdf:Property | 0 | 1 | qudt:SystemOfUnits | -- | ||
| qudt:systemDerivedQuantityKind | rdf:Property | 0 | * | qudt:QuantityKind | -- | ||
| 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: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#> .
qudt:SystemOfQuantityKinds a rdfs:Class,
sh:NodeShape ;
rdfs:label "System of Quantity Kinds" ;
dcterms:description """
<p>A <em>System of Quantity Kinds</em> 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.
</p>
<p>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.
</p>"""^^rdf:HTML ;
rdfs:isDefinedBy <http://qudt.org/3.5.2/schema/shacl/qudt> ;
rdfs:subClassOf qudt:Concept,
qudt:Verifiable ;
sh:property qudt:SystemOfQuantityKinds-baseDimensionEnumeration,
qudt:SystemOfQuantityKinds-hasBaseQuantityKind,
qudt:SystemOfQuantityKinds-hasQuantityKind,
qudt:SystemOfQuantityKinds-hasUnitSystem,
qudt:SystemOfQuantityKinds-systemDerivedQuantityKind .