Legislative committee membership

This is a compound-value type that records information about a person's membership on a committee that is part of a legislative body. It connects the person to the committee served on, along with the title, legislative session, and dates served.

If a person has served on a committee in more than one capacity, that should be entered as separate instances. E.g., if a person was a member of a committee for three legislative sessions, and the chair for a fourth, two separate memberships should be created. 

There is, perhaps, an apparent redundancy between the legislative session and start and end date properties. That is, since legislative sessions should also have their own start and end dates, either the session or dates served could be inferred. The start and end date properties allow for a great deal of precision, and may be particularly useful in cases where a person did not serve on a committee for the full session or if you want to compare total length of service. The legislative session property permits easy access to the membership of committees within a given session or sessions.
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