Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
vessel head
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
The concept is defined primarily by its physical configuration as a structural component that 'closes a vessel shell'. The identity is given by its geometric role as an end closure, not by any specific function independent of its structural position and shape.
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
ContainmentFunction → ContainmentProcess ⊑ MaterialContainment
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COPI-Core operation
MaterialContainment via process parent MaterialContainment
LLM rationale:
Reusing the existing ContainmentFunction from the vessel class, as vessel heads participate in the same containment function as the vessel they close - they are structural components that contribute to the overall containment capability rather than having an independent function.
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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:
A vessel head is not an independent object but rather a demarcated portion of a larger vessel assembly. It has no independent causal boundary or maintainability - it is a structural part defined by its position (closing the vessel shell) rather than being a standalone artifact. This fits the BFO definition of FiatObjectPart as a portion of an object demarcated by fiat.
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Expert review
3
Differentia Specifica
✓ done
∃partOf.Vessel ⊓ ∃realizes.VesselClosureRole
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Conditions that distinguish
Vessel Head
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 the specific structural role of closing a vessel shell, which distinguishes vessel heads from other vessel parts. The closure function is what defines this component's identity within the vessel assembly.
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Expert review
4
Necessary Parts
✓ done
no necessary parts
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Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
No component terms are provided in the source standards, and the definition does not specify necessary sub-parts. Vessel heads can vary significantly in design (flat, dished, hemispherical) with different internal structures, so no universal parts can be identified at this level without more specific information.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
∅ → ∅
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Vessel heads do not process material streams - they are passive structural components that contribute to containment by closing vessel openings. They enable the vessel's containment function but do not transform inputs to outputs themselves.
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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
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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 Vessel Head.
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
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Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
Source Definitions (1)
VESSEL HEAD — ClassOfInanimatePhysicalObject
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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
- open What is a vessel head?
- open Is a vessel head a necessary component of every vessel?
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 407 · claude-sonnet-4-20250514
Created 2026-05-04 18:27
Updated 2026-09-08 12:26
