TimeClockPropertyType Calendars and clocks .1 Overview

Copyright © 2007 Open Geospatial Consortium, Inc. All Rights Reserved. 167 gml:member properties which indicate ordered gml:TimeOrdinalEra elements, and a gml:group property which points to the parent era. This is declared as follows: element name=TimeOrdinalEra type=gml:TimeOrdinalEraType complexType name=TimeOrdinalEraType complexContent extension base=gml:DefinitionType sequence element name=relatedTime type=gml:RelatedTimeType minOccurs=0 maxOccurs=unbounded element name=start minOccurs=0 type=gml:TimeNodePropertyType element name=end minOccurs=0 type=gml:TimeNodePropertyType element name=extent type=gml:TimePeriodPropertyType minOccurs=0 element name=member type=gml:TimeOrdinalEraPropertyType minOccurs=0 maxOccurs=unbounded element name=group type=gml:ReferenceType minOccurs=0 sequence extension complexContent complexType The recursive inclusion of gml:TimeOrdinalEra elements allow the construction of an arbitrary depth hierarchical ordinal reference schema, such that an ordinal era at a given level of the hierarchy includes a sequence of shorter, coterminous ordinal eras. EXAMPLE The example below shows a portion of the geological time scale depicted as an ordinal reference system: gml:TimeOrdinalReferenceSystem gml:id=GeologicalTimeScale gml:description xlink:href=ftp:ftp.iugs.orgpubiugsiugs_intstratchart.pdf gml:nameGeological time scalegml:name gml:domainOfValidityEarthgml:domainOfValidity -- Earlier eras omitted -- gml:component gml:TimeOrdinalEra gml:id=Cenozoic gml:nameCenozoic Eragml:name gml:start xlink:href=basePaleocene gml:end xlink:href=now gml:member gml:TimeOrdinalEra gml:id=Tertiary gml:nameTertiary Periodgml:name gml:start xlink:href=baseTertiary gml:end xlink:href=basePleistocene gml:member gml:TimeOrdinalEra gml:id=Paleogene gml:namePaleogene sub-periodgml:name gml:start gml:TimeInstant gml:id=basePaleogene gml:timePosition frame=geologyMa65.0gml:timePosition gml:TimeInstant gml:start gml:end xlink:href=baseNeogene gml:member gml:TimeOrdinalEra gml:id=Paleocene gml:namePaleocene Epochgml:name gml:start xlink:href=basePaleogene gml:end xlink:href=baseEocene gml:TimeOrdinalEra gml:member gml:member gml:TimeOrdinalEra gml:id=Eocene gml:namePaleocene Epochgml:name gml:start