"Cube Schema" . "Constraint" . . "Specifies constraints that need to be met on the Cube. Used for metadata and validation." . "Cube" . . "Represents the entry point for a collection of observations, conforming to some common dimensional structure." . "Observation" . . "A single observation in the cube, may have one or more associated dimensions." . "Observation Set" . . "A set of observations." . "observation" . . "Connects a set of observations with a single observation." . . . "observation constraint" . . "Connects a cube with a constraint for metadata and validation." . . . "observation set" . . "Connects a cube with a set of observations." . . . "observed by" . . "Connects an observation with the agent that created the observation. The agent can be a person, organisation, device or software. A description of the method to gather the data could be attached to the agent." . . . "Undefined observation." . . "An observation which is not defined." . "Key Dimension" . . "The KeyDimension tags one or multiple dimensions which are together uniquely identifying an observation. You can think of them as the Key in a relational database." . "Measure Dimension" . . "The MeasureDimension tags at least one dimension, but potentially multiple, which is the actual measurement, or statistical count attached to an observation." .