Entities
An entity groups objects that share the same characteristics and have similar behavior. Persistent entities are management elements considered useful for representing enterprise activity, and are therefore reserved for this purpose. They will have corresponding tables in the relational database.
An entity is described by a list of attributes.
An entity is linked to other entities via associations. The set of entities and associations forms the core of a data model.
We can illustrate the entity concept by comparing entities to index cards filed in drawers.
Entities can represent management objects.
Examples: Customer, Order, Product, Person, Company, etc.
Entities can represent technical objects used in industry.
Examples: Alarm, Sensor, Zone
Creating an entity
To create an entity:
1. In the data diagram click
Entity (DM) 
in the objects toolbar.
2. Click in the diagram.
The Add Entity (DM) dialog box opens.
3. Enter the entity Name.
4. Click Create.
The entity appears in the diagram.
