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This vocubulary is intended as a companion vocabulary to the Cube Schema vocabulary.
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A hierarchy is defined and can be named schema:name. This can help user interfaces to allow a selection in case of multiple hierarchies.
A meta:Relation resource is used to express the relation or hierarchy between different dimensions, the nature of the relationship is determined by the properties used. A meta:Relation is linked to an observation through a meta:relatesTo property.
To express that the dimension provides a specific kind of data which is necessary to select the correct visual representation you can add a meta:dataKind resource with the following possible structures:
schema:GeoCoordinates: To hint that the dimension does provide Resources with latitude and longitude which can be shown on a map.schema:GeoShape: To hint that the dimension does provide Resources that have a shape that can be shown on a map.
time:GeneralDateTimeDescription: To hint that the dimension does provide Resources that can be shown on a timeline.
It is further possible to add time:unitType to hint about the precision in which the dimension should be presented. A time:TemporalUnit is expected: time:unitYear, time:unitMonth, time:unitWeek, time:unitDay, time:unitHour, time:unitMinute and time:unitSecond.
A meta:dimensionRelation property is used to express the relation of this dimension in related to other dimension, examples are Deviation and StandardError
This property is mandatory and defines one or multiple root concepts. It is the starting point of the hierarchy which is then defined through a cascade of levels where the use of sh:path is connecting the concepts. The simplest case is only two levels, the root level and how they are connected to the observations in the dimension. If there are multiple levels they are nested with 'meta:nextInHierarchy'.
This property is used on a Dimension Constraint to express a hierarchy implemented. It points to a meta:Hierarchy which is the root level of the defined hierarchy. It is possible to add multiple different hierarchies on one dimension.
A hierarchy must have at least one meta:hierarchyRoot.
With meta:nextInHierarchy the next lower level is attached to the higher level or the root level of a hierarchy.
This property is used on a Dimension Constraint to express a relation with other properties through a meta:Relation instance, the nature of this relationship is determined by the properties used on the instance. See this example.