OGC Definitions Service (Beta)

http://www.opengis.net/def/verticalDatumType/OGC

http://www.opengis.net/def/verticalDatumType/OGC

label http://www.opengis.net/def/verticalDatumType/OGC more like this
type
Collection
is primary topic of OGC
same as
OGC Vertical Datum Types
same as OGC