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Annotations
Attributes
Diagrams
Instances
Properties
Source
Element gml:TimeOrdinalReferenceSystem
Namespace http://www.opengis.net/gml/3.2
Annotations
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. 
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.
Diagram
Diagram index0.tmp#id77 index1.tmp#id71 index2.tmp#id92 index3.tmp#id94 index4.tmp#id98 index5.tmp#id103 index6.tmp#id70 index7.tmp#id69 index0.tmp#id77 index1.tmp#id71 index2.tmp#id92 index3.tmp#id94 index4.tmp#id98 index5.tmp#id103 index8.tmp#id628 index9.tmp#id629 index10.tmp#id627 index420.tmp#id1960 index420.tmp#id1959 index421.tmp#id1982 index421.tmp#id1981
Type gml:TimeOrdinalReferenceSystemType
Type hierarchy
Properties
content: complex
Model gml:metaDataProperty* , gml:description{0,1} , gml:descriptionReference{0,1} , gml:identifier , gml:name* , gml:remarks{0,1} , gml:domainOfValidity , gml:component+
Children gml:component, gml:description, gml:descriptionReference, gml:domainOfValidity, gml:identifier, gml:metaDataProperty, gml:name, gml:remarks
Instance
<gml:TimeOrdinalReferenceSystem gml:id="">
  <gml:metaDataProperty about="" xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,unbounded}</gml:metaDataProperty>
  <gml:description xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,1}</gml:description>
  <gml:descriptionReference xlink:actuate="" xlink:arcrole="" xlink:href="" nilReason="" owns="false" gml:remoteSchema="" xlink:role="" xlink:show="" xlink:title="" xlink:type="simple">{0,1}</gml:descriptionReference>
  <gml:identifier codeSpace="">{1,1}</gml:identifier>
  <gml:name codeSpace="">{0,unbounded}</gml:name>
</gml:TimeOrdinalReferenceSystem>
Attributes
QName Type Fixed Default Use Annotation
gml:id ID required
The attribute gml:id supports provision of a handle for the XML element representing a GML Object. Its use is mandatory for all GML objects. It is of XML type ID, so is constrained to be unique in the XML document within which it occurs.
Source
<element name="TimeOrdinalReferenceSystem" type="gml:TimeOrdinalReferenceSystemType" substitutionGroup="gml:TimeReferenceSystem">
  <annotation>
    <documentation>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. 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.</documentation>
  </annotation>
</element>
Schema location http://schemas.opengis.net/gml/3.2.1/temporalReferenceSystems.xsd