Members are the attributes and associations of a Mendix entity. In other words, entities can have attribute members and association members. Attribute members are the primitive types (String, Integer, Long, Boolean, ...), and association members are the relations to other entities (e. g. entity "Person" could have an association member "isEnrolledIn" to entity "Class". Person could have the attribute members "FirstName", "LastName", "Age", ..., "Class" could have attribute members "Subject", "NumberOfSeats", ....

In Mendix, "members" refer to the properties of an entity that define its structure and behavior. Members include both attributes and associations, which are essential for modeling the data and relationships within the application.

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1. Attributes:

   • These are data fields that store specific pieces of information about an entity. Each attribute has a name, type (such as String, Integer, Boolean, DateTime, etc.), and other properties like default value, validation rules, and visibility settings.
   • For example, an entity "Employee" might have attributes like Name (String), Age (Integer), HireDate (DateTime), and IsActive (Boolean).

2. Associations:

   • These define relationships between different entities. Associations can be one-to-one, one-to-many, or many-to-many.
   • For example, an entity "Employee" might have an association with an entity "Department", indicating that each employee belongs to one department and each department can have multiple employees.

Associations have their own properties, such as the association type, cardinality (one-to-one, one-to-many, etc.), and the delete behavior (what happens to associated objects when an object is deleted).