exported
equivalent
level element
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Levelelement
Generated on 2026-05-02
Natural Language Definition
EN
A level element is an instrument that bears a level detection function for determining fluid level in a vessel or container.
PT-BR
Um elemento de nível é um instrumento que possui uma função de detecção de nível para determinar o nível de fluido em um vaso ou recipiente.
Formal Axioms
Semi-formal (Aristotelian)
Every level element is a detector that has the function to detect fluid level
First-Order Logic Theory
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▸ Stored override
∀x (LevelElement(x) ↔ Detector(x) ∧ ∃f(LevelDetectionFunction(f) ∧ bearerOf(x,f)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: LevelElement
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-08"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000176 rdf:type owl:Class ; # LevelDetectionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000563 # LevelDetectionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000563 # LevelDetectionProcess
] ;
rdfs:label "level detection function"@en ;
rdfs:label "função de detecção de nível"@pt-br .
### Process type
:COPI_0000563 rdf:type owl:Class ; # LevelDetectionProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "level detection process"@en ;
rdfs:label "processo de detecção de nível"@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000563 # LevelDetectionProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000050 # LevelMeasurementResult
] .
### Equipment universal: LevelElement
:COPI_0000128 rdf:type owl:Class ; # LevelElement
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000091 # Instrument
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000176 # LevelDetectionFunction
]
)
] ;
rdfs:label "level element"@en ;
rdfs:label "elemento de nível"@pt-br ;
iof-av:naturalLanguageDefinition "A level element is an instrument that bears a level detection function for determining fluid level in a vessel or container."@en ;
skos:definition "A level element is an instrument that bears a level detection function for determining fluid level in a vessel or container."@en ;
iof-av:naturalLanguageDefinition "Um elemento de nível é um instrumento que possui uma função de detecção de nível para determinar o nível de fluido em um vaso ou recipiente."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every level element is a detector that has the function to detect fluid level"@en ;
iof-av:firstOrderLogicAxiom "∀x (LevelElement(x) ↔ Detector(x) ∧ ∃f(LevelDetectionFunction(f) ∧ bearerOf(x,f)))"@en ;
skos:definition "[CFIHOS] A detecting element that is intended to determine a level."@en .
# Disjointness: LevelElement and PressureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000128 :COPI_0000144 ) . # LevelElement, PressureTransmitter
# Disjointness: LevelElement and TemperatureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000128 :COPI_0000155 ) . # LevelElement, TemperatureTransmitter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
LevelDetectionFunction
⊑ DesignedFunction
Realized in
LevelDetectionProcess
⊑ MeasurementProcess
The identity-giving function is to detect or determine fluid level. This is a specific type of detection function focused on level measurement, distinct from other detection functions like pressure, temperature, or flow detection.
✓
Expert review — Accepted
2
Genus Determination
Instrument
From the parent_candidates, 'detecting element' is mentioned, but 'detector' is already enriched in our ontology with DetectionFunction. A level element is a specialized detector focused on level detection. The genus 'detector' is more specific than 'Instrument' and captures the detecting nature accurately.
✓
Expert review — Accepted
"genus: 'detector' (não enriquecido) → Instrument; bfo_root: Assembly → MaterialArtifact"
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
Level elements require both a sensing component that physically detects the level and a transduction component that converts this into a measurable or transmittable form. Specific mechanisms (radar antenna, ultrasonic transducer, float, etc.) are subtype-specific.
✓
Expert review — Accepted
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— contained in vessel or tank
Outputs (O)
LevelMeasurementResult
— proportional to fluid level
Transformation (T)
physical level measurement converted to signal representation
Level elements take the physical state of a fluid (its level in a container) as input and produce a signal output that represents that level measurement. No material transformation of the fluid occurs.
✓
Expert review — Accepted
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
✓
Expert review — Accepted
Disjointness Axioms
pressure transmitter
temperature transmitter
C2: flow meter. C?: pressure transmitter [kind_ambiguous]. C?: temperature transmitter [kind_ambiguous]. Level elements have incompatible process signatures with flow meters (which measure flow rate), pressure transmitters (which measure pressure), and temperature transmitters (which measure temperature). Different physical phenomena being measured make them mutually exclusive equipment types.
Cross-Standard Observations
Only CFIHOS provides a definition. The concept is well-established with clear functional identity. Subtypes (radar, ultrasonic) confirm this is a functional classification with various constructive implementations.
