"exercise"@en . "project"@en . "investigation"@en . "task"@en . "sensor"@en . "platform"@en . "collection"@en . "program"@en . . . . . . . . . . . . . . "DS_InitiativeTypeCode" . "Type of aggregation activity in which datasets are related" . . . . "experiment"@en . "study"@en . "mission"@en . "trial"@en . "operation"@en . "campaign"@en . "process"@en .