Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
level sight glass
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
A level sight glass is defined by its function of enabling visual inspection of liquid levels in vessels/pipes. The differentia is the specific measurement function (level indication) rather than the structural mechanism of transparency.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
LevelIndicationFunction → LevelIndicationProcess ⊑ MeasurementProcess
▼
COPI-Core operation
MeasurementProcess via process parent MeasurementProcess
LLM rationale:
The identity-giving function is providing visual indication of liquid level - this is what makes it a level sight glass rather than just a general sight glass or other instrumentation item
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Expert review
2
Genus Proximus
✓ done
SightGlass · MaterialArtifact
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Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
ISO 15926 explicitly states it is a SIGHT GLASS - this is the most specific superclass. SightGlass is not yet enriched in our ontology but is the natural genus. INSTRUMENTATION ITEM is too broad as genus. SightGlass would be a MaterialArtifact as it is a causally unified transparent window component.
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Expert review
3
Differentia Specifica
✓ done
∃hasFunction.LevelIndicationFunction
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Conditions that distinguish
Level Sight Glass
from sibling classes under genus
SightGlass.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia is the specific level indication function - the genus SightGlass already provides visual inspection capability, so the species-specific function is what distinguishes level sight glasses from other sight glass types
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Expert review
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
Level sight glasses inherit basic sight glass components but add level measurement specific parts like graduated scales or reference markings
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfLiquid → VisualIndication
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Takes liquid level as input and transforms it into visual indication for human observation - no material transformation of the liquid itself
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Expert review
More
Alternative labels
none
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Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
no CFIHOS/DEXPI properties
▼
No CFIHOS/DEXPI properties found for this cluster.
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Level Sight Glass.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
Source Definitions (1)
LEVEL SIGHT GLASS — ClassOfInanimatePhysicalObject
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (1)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
Linked competency questions
- answered Which equipment classes in COPI have iof:MaterialArtifact as their BFO genus root?
- answered What distinguishes a level sight glass from a level transmitter?
- open What is a sight glass?
- open Is sight glass the correct genus for level sight glass in the COPI ontology?
OWL/Turtle preview
Download .ttl
Numeric
COPI_* IRIs from copi-iri-map.tsv, with the readable name as a trailing comment. Names not yet in the map stay readable.
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ID 59 · claude-sonnet-4-20250514
Created 2026-04-13 23:41
Updated 2026-09-08 20:36
