An attribute that must be present for every entity (or relationship) instance is a required attribute.
Entities are represented through their properties, which are referred to as attributes. Every attribute has a value.
The required attribute is a bool attribute.
When present, it indicates that the element must be completed before the form can be submitted.
The Required Attribute attribute is used to override the database schema rule that enables a data field to be empty.
Implements a metadata partial class and its corresponding metadata class.
It uses the Required Attribute element in the related metadata class to specify the following requirements:
The Title data field cannot be left blank.
The Middle Name cannot be left blank.
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