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http://def.isotc211.org/iso19116/2019/PositioningServiceModel#
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PS_Observation.observationDateTime
http://def.isotc211.org/iso19116/2019/PositioningServiceModel#PS_Observation.observationDateTime
skos:definition
http://www.w3.org/2004/02/skos/core#definition
Date and time the observation(s) were made (or commenced)
graph:default
https://triplydb.com/iso/19116/graphs/default