Namespace: |
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Type: |
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Content: |
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Subst.Gr: |
may substitute for elements: gml:TimeReferenceSystem, gml:Definition, gml:AbstractGML, gml:AbstractObject |
Defined: |
globally in temporalReferenceSystems.xsd; see XML source |
Used: |
never |
XML Representation Summary |
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<gml:TimeOrdinalReferenceSystem |
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> |
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</gml:TimeOrdinalReferenceSystem> |
<element name="TimeOrdinalReferenceSystem" substitutionGroup="gml:TimeReferenceSystem" type="gml:TimeOrdinalReferenceSystemType">
<annotation>
<documentation>
</annotation>
In some applications of geographic information — such as geology and archaeology — relative position in time is known more precisely than absolute time or duration. The order of events in time can be well established, but the magnitude of the intervals between them cannot be accurately determined; in such cases, the use of an ordinal temporal reference system is appropriate. An ordinal temporal reference system is composed of a sequence of named coterminous eras, which may in turn be composed of sequences of member eras at a finer scale, giving the whole a hierarchical structure of eras of verying resolution.
</documentation>
An ordinal temporal reference system whose component eras are not further subdivided is effectively a temporal topological complex constrained to be a linear graph. An ordinal temporal reference system some or all of whose component eras are subdivided is effectively a temporal topological complex with the constraint that parallel branches may only be constructed in pairs where one is a single temporal ordinal era and the other is a sequence of temporal ordinal eras that are called "members" of the "group". This constraint means that within a single temporal ordinal reference system, the relative position of all temporal ordinal eras is unambiguous. The positions of the beginning and end of a given era may calibrate the relative time scale. gml:TimeOrdinalReferenceSystem adds one or more gml:component properties to the generic temporal reference system model. </element>
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Type: |
ID, predefined
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Use: |
required |
Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
gml:TimeOrdinalEraPropertyType, complex content |
Defined: |
locally within gml:TimeOrdinalReferenceSystemType complexType |
Type: |
gml:StringOrRefType, simple content
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Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
gml:ReferenceType, empty content
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Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
string, predefined, simple content |
Defined: |
locally within gml:TimeReferenceSystemType complexType |
Type: |
gml:CodeWithAuthorityType, simple content
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Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
gml:MetaDataPropertyType, complex content
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Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
gml:CodeType, simple content
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Defined: |
by reference within gml:DefinitionBaseType complexType |
Type: |
string, predefined, simple content
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Defined: |
by reference within gml:DefinitionType complexType |
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