Root element for a WADI Import and Export Set; can contain one or more: (a) Referenced definitions (from WADI dictionaries) (b) Other referenced metadata (system generated) (c) Containers (datasets) Definitions (from WADI dictionaries) will only occur in this declarative way in a WADI Export Set System managed Definitions and Metadata; will only occur in this declarative way in a WADI Export Set Semi-system managed Definitions; will only occur in this declaritive way in a WADI Export Set (Super)Containers Only accurs when series is part of a compoundValueDefinition Supports use of nl and en mandatory if sampleobject doesn't contain a namedLocation Location - Geometry contains MultiSurface Domain Geometry only contains SpatialEnvelop; Geometry of grid i sotherwise specified only mandatory with Named Location in WADI1