两个类与两个表的nHibernate映射

我正在开发web应用程序。我想映射类和表。现在我有三张表了。我想要这些表和类的xml映射，但不能更改表结构。

我有这样的细节

> Table and Fields
>     1. **User**
>      UserID,
>      FirstName,
>      LastName,
>     2. **Detail**
>      DetailID ,
>      UserID,
>      Address,
>      City
     3. Contact
     ContactID
     UserID
     Mobile
     Home
I have two classes. User and Detail
     public class User
    {
     public RegionalPreference()
            {
                RP_Region = new List<RegionalPreference_Region>();
            }
            public virtual uint UserID { get; set; }
            public virtual string FirstName{ get; set; }
            public virtual string LastName { get; set; }
            public virtual Contact Contacts { get; set; }
            public virtual List<Detail> Details { get; set; }
    }
     public class Detail
        {
                public virtual uint DetailID { get; set; }
                public virtual uint UserID { get; set; }
                public virtual string Address{ get; set; }
                public virtual string City { get; set; }
        }
> public class Contact
>         {
>                 public virtual uint UserID { get; set; }
>                 public virtual string Mobile{ get; set; }
>                 public virtual string Home { get; set; }
>         }