Temporal Hierarchical Ordinal Reference System model
type: Vocabulary
type: Ontology
contributor: Stephen M Richard
created: 2011-01-01
creator: Simon J D Cox
description: An OWL representation of the model for Temporal Hierarchical Ordinal Reference Systems defined in GeoSciML v3, and modeled after ISO 19108. The THORS ontology introduces the classes thors:Era and thors:eraBoundary which are elements in a thors:ReferenceSystem. The temporal positions of boundaries, and topological relationships between Eras are aligned to the Allen temporal algebra, as implemented in OWL-Time.
license: https://creativecommons.org/publicdomain/zero/1.0/
modified: 2023-05-12
rights: Copyright 2012-2020 CSIRO
source: Simon J.D. Cox and Stephen M. Richard, A formal model for the geologic time scale and global stratotype section and point, compatible with geospatial information transfer standards, Geosphere, 1, 119-137 (2005)
preferred namespace prefix: thors
preferred namespace uri: http://resource.geosciml.org/ontology/timescale/thors#
imports: http://purl.org/dc/elements/1.1/
imports: time
change note: 2017-04-28 - removed imports of ISO ontologies
change note: 2020-05-31 - add OWL-Time alignment to primary graph; add inline examples for documentation
change note: 2023-05-12 - fix type of thors:positionalUncertainty
note: This model is related to the model for TORS in ISO 19108:2002, except that boundaries between eras are first class objects, supporting multiple properties, rather than being just time coordinates. It is also linked to the ISO 19108 Temporal Topology model.
code repository: timescale-ont

Time Ordinal Era or Interval
type: Class
description: A temporal era is a named or identified interval from a temporal ordinal reference system
subclass of: Concept
subclass of: ProperInterval
subclass of: Restriction
  cardinality: 1
  on property: era beginning
subclass of: Restriction
  cardinality: 1
  on property: era end

Time Ordinal Era Boundary
type: Class
description: A temporal era boundary starts or ends a named or identified interval from a temporal ordinal reference system
subclass of: Concept
subclass of: Instant
subclass of: Restriction
  min cardinality: 1
  on property: next era
subclass of: Restriction
  min cardinality: 1
  on property: previous era

Hierarchical Time Ordinal Reference System
type: Class
description: A temporal ordinal reference system is a constrained temporal topological complex, in which the edges are called 'eras'. Each era may be subdivided into one set of eras of the next finer rank. This constraint is required to establish a mono-hierarchy, so that a set of temporal positions defined relative to the reference system may be uniquely ordered.
subclass of: ConceptScheme
subclass of: TRS
subclass of: Restriction
  min cardinality: 1
  on property: temporal reference system component
subclass of: Restriction
  min cardinality: 2
  on property: reference point in timescale

era beginning
type: DeprecatedProperty
type: ObjectProperty
domain: Time Ordinal Era or Interval
range: Time Ordinal Era Boundary
sub property of: semanticRelation
sub property of: hasBeginning
deprecated: true
inverse of: next era

temporal reference system component
type: ObjectProperty
domain: Hierarchical Time Ordinal Reference System
range: Time Ordinal Era or Interval
sub property of: hasTopConcept
inverse of: system

era end
type: DeprecatedProperty
type: ObjectProperty
domain: Time Ordinal Era or Interval
range: Time Ordinal Era Boundary
sub property of: semanticRelation
sub property of: hasEnd
deprecated: true
inverse of: previous era

era member / sub-era
type: DeprecatedProperty
type: ObjectProperty
domain: Time Ordinal Era or Interval
range: Time Ordinal Era or Interval
sub property of: narrower
deprecated: true
equivalent property: ObjectProperty
  inverse of: intervalIn

next era
type: ObjectProperty
domain: Time Ordinal Era Boundary
range: Time Ordinal Era or Interval
sub property of: semanticRelation
sub property of: ObjectProperty
  inverse of: hasBeginning
inverse of: era beginning

uncertainty in temporal position
type: ObjectProperty
domain: TimePosition
range: Duration

previous era
type: ObjectProperty
domain: Time Ordinal Era Boundary
range: Time Ordinal Era or Interval
sub property of: semanticRelation
sub property of: ObjectProperty
  inverse of: hasEnd
inverse of: era end

reference point in timescale
type: ObjectProperty
domain: Hierarchical Time Ordinal Reference System
range: Time Ordinal Era Boundary
sub property of: hasTopConcept

system
type: ObjectProperty
comment: reference system that this era belongs to
domain: Time Ordinal Era or Interval
range: Hierarchical Time Ordinal Reference System
sub property of: topConceptOf
inverse of: temporal reference system component

Stephen M Richard
type: NamedIndividual
type: Person

Simon J D Cox
type: NamedIndividual
type: Person
affiliation: CSIRO