Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
expansion joint
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
The concept is consistently defined across standards by its identity-giving function: accommodating thermal expansion/contraction between connected components without distortion. This is a specific designed function that distinguishes expansion joints from other connection elements.
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
⚠ not anchored
ThermalExpansionAccommodationFunction → ThermalExpansionAccommodationProcess
▼
COPI-Core operation
⚠ Process parent
PlannedProcess reaches no COPI-Core operation, and no gap (out of scope / coverage gap) is recorded.
LLM rationale:
All definitions consistently identify thermal expansion accommodation as the identity-giving purpose: allowing relative movement between fixed assemblies during thermal changes without mechanical distortion or failure of the connection.
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Expert review
2
Genus Proximus
✓ done
MaterialArtifact
▼
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 identifies expansion joint as both ARTEFACT and JOINT. No specific 'Joint' superclass exists in our enriched ontology. The parent candidates (ARTEFACT, JOINT, other mechanical equipment) are too generic. Expansion joints are manufactured artifacts with designed function, fitting MaterialArtifact directly. They are typically monolithic flexible components rather than assemblies with removable subparts.
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Expert review
3
Differentia Specifica
✓ done
∃bearerOf.ThermalExpansionAccommodationFunction ⊓ ∃bearerOf.FlexibilityFunction
▼
Conditions that distinguish
Expansion Joint
from sibling classes under genus
MaterialArtifact.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia captures both the specific designed function (thermal expansion accommodation) and the enabling structural property (flexibility) that distinguishes expansion joints from other connection artifacts.
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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:
These represent the minimal necessary parts: a flexible element to enable movement and connection interfaces to attach to the system components.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
∅ → ∅
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Expansion joints transform thermal expansion forces into controlled structural displacement, preventing damage to connected components while maintaining system integrity.
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Expert review
More
Alternative labels
none
▼
Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
0 of 17 selected
▼
Select which CFIHOS/DEXPI properties inhere in every instance of Expansion Joint as
bfo:Quality subclasses.
Each selected property →
:ExpansionJointQuality ⊑ bfo:Quality, inheres in :ExpansionJoint
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Expansion Joint.
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.
