An Attribute is a item of information used to add additional metadata to a key or observation or group.
A dataflow is a component that represents the collection of reporting data over time.
A DataStructure identifies the dimensionality of a dataset in terms of the codelists and concepts used.
A dimension is one component of a key that together with other dimensions of the key uniquely identify the observation.
A group is a subset of the dimensionality of the full key.
This is the measure used in time series data.