Business terms are represented in the Vocabulary as either entities or attributes.

An attribute is like a data field that holds a value. An entity is a collection of attributes. For example, the term cargo may have data fields such as cargoID, weight, volume, and so on. So, cargo should be defined as an entity in a Vocabulary and the terms cargo ID, weight, and volume as attributes that belong to the entity cargo.

Relationships between entities are represented as associations in a Vocabulary. For example, since a vehicle can carry multiple cargo containers, you can create a one-to-many association between the vehicle entity and the cargo entity in a Vocabulary.