Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
piston
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
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
ReciprocatingDisplacementFunction → ReciprocatingDisplacementProcess ⊑ MomentumTransfer
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COPI-Core operation
MomentumTransfer via process parent MomentumTransfer
LLM rationale:
ISO 15926 states the purpose explicitly: it reciprocates within a hollow outer cylinder 'to change the internal volume of the outer cylinder in order to either discharge pressurized liquid or gas'.
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Expert review
2
Genus Proximus
✓ done
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 types PISTON as an ENGINE COMPONENT and a DISPLACER; neither is declared in COPI, so MaterialArtifact is the nearest available superclass.
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Expert review
3
Differentia Specifica
✓ done
∃bearerOf.ReciprocatingDisplacementFunction ⊓ ∃componentPartOf.Cylinder
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Conditions that distinguish
Piston
from sibling classes under genus
MaterialArtifact.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
Constructive basis: the ISO definition constrains shape ('normally of the cylindrical shape', 'provided with a closed end') as well as function. Necessary-only.
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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:
No sub-component is named in any source definition for this term. validate_necessary_parts_quotes() requires a verbatim source_quote for every part, and there is nothing to quote — so no parts are asserted (ODR-022 §10.2).
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
The piston converts reciprocating mechanical motion into fluid displacement; the fluid is the participant, the mechanical work is not (ODR-010 §5.1).
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Expert review
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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 Piston.
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)
PISTON — 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.
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 1035 · claude-opus-5
Created 2026-08-08 21:02
Updated 2026-09-08 12:26
