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In the Entity Data Model (EDM), the Type attribute of a Property element specifies the data type that can be assigned to instances of the type.
The following definition of the Department entity includes four Property elements. Each property has a Type attribute that has an assigned data type. For example, the DepartmentID property assignment is Type="Int16". The DepartmentID property is also designated the Key property of the Department entity.
<EntityType Name="Department" >
<Key>
<PropertyRef Name="DepartmentID">
</Key>
<Property Name="DepartmentID" Type="Int16" Nullable="false" />
<Property Name="Name" Type="String" Nullable="false" />
<Property Name="GroupName" Type="String" Nullable="false" />
<Property Name="ModifiedDate" Type="DateTime" Nullable="false" />
</EntityType>