A label is an attribute that describes its entity or relationship with nominal data.
A label is also known as:
Classifiers / Label can be organized in hierarchies.
They are the output of a classification process
In dimensional data, they are known as dimensional attribute.
They are used to label, filter and/or group on whereas additive numeric attribute are used to aggregate over.
They also create an aggregation relationship between entities.
There is two kind of label identifier: