Consider an application consisting of Employees and Administrators.

An employee consists of an EmployeeId, Name and EmailAddress.

The employees are stored in a legacy system and are readonly so I have
an immutable Employee class mapped to a view (vw_Employee) as follows:

vw_Employee
----------------------
EmployeeID (key)
Name
EmailAddress

Now for this application, some of the employee's will be marked as
administrators (Image a screen with a drop down list of employees, you
select one, click add and that employee is now an administrator).

An administrator is an employee (has exactly the same fields) so the
database table only needs to look like the following:

Administrators
----------------------
EmployeeID (key)

In the same application, I will need to display a list of all the
administrators names and email address

Without NHibernate I could get a list of administrators by joining the
[Administrators] table with the [vw_Employee] view using the
EmployeeID primary key

The issue I'm having is what should the Administrator class look like
and how would I map this using NHibernate.

Any help would be much appreciated

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