OGC Definitions Service (Beta)

http://www.opengis.net/def/vertical-datum-type/ogc/

http://www.opengis.net/def/vertical-datum-type/ogc/

label http://www.opengis.net/def/vertical-datum-type/ogc/ more like this
type
Collection
is primary topic of &_format=html
same as
OGC Vertical Datum Types
same as ogc