Bag=IList
Set=Iesi.Collections.ISet
List=IList
Map=IDictionary

using System.Collections.Generic;

namespace Test1.Model12
{
   public class User
   {
       public virtual int Id { set; get; }
       public virtual string Name { get; set; }
       public virtual IDictionary<string, string> Preferences { get; set; }
   }
}

using FluentNHibernate.Automapping;
using FluentNHibernate.Automapping.Alterations;

namespace Test1.Model12
{
   public class UserMapping : IAutoMappingOverride<User>
   {
       public void Override(AutoMapping<User> mapping)
       {
           mapping.Id(x => x.Id);
           mapping.HasMany(x => x.Preferences)
               .AsMap<string>("FieldKey")
               .Element("FieldValue", x => x.Type<string>().Length(500));
       }
   }
}

create table "User" (
      Id INT IDENTITY NOT NULL,
      Name NVARCHAR(255) null,
      primary key (Id)
   )

create table Preferences (
      User_id INT not null,
      FieldValue NVARCHAR(500) null,
      FieldKey NVARCHAR(255) not null,
      primary key (User_id, FieldKey)
   )

alter table Preferences
       add constraint FKD6CB18523B1FD789
       foreign key (User_id)
       references "User"

using System.Collections.Generic;

namespace Test1.Model13
{
   public class User
   {
       public virtual int Id { get; set; }
       public virtual string Name { get; set; }
       public virtual IDictionary<string, Property> Properties { get; set; }
   }

   public class Property
   {
       public virtual int Id { get; set; }
       public virtual string Name { get; set; }
       public virtual string Value { get; set; }
       public virtual User User { get; set; }
   }
}

using FluentNHibernate.Automapping;
using FluentNHibernate.Automapping.Alterations;

namespace Test1.Model13
{
   public class UserMapping : IAutoMappingOverride<User>
   {
       public void Override(AutoMapping<User> mapping)
       {
           mapping.Id(x => x.Id);
           mapping.HasMany<Property>(x => x.Properties)
               .AsMap<string>("FieldKey")
               .Component(x => x.Map(c => c.Id));
       }
   }
}

create table "Property" (
      Id INT IDENTITY NOT NULL,
      Name NVARCHAR(255) null,
      Value NVARCHAR(255) null,
      User_id INT null,
      primary key (Id)
   )

create table "User" (
      Id INT IDENTITY NOT NULL,
      Name NVARCHAR(255) null,
      primary key (Id)
   )

create table Properties (
      User_id INT not null,
      Id INT null,
      FieldKey NVARCHAR(255) not null,
      primary key (User_id, FieldKey)
   )

alter table "Property"
       add constraint FKF9F4D85A3B1FD7A2
       foreign key (User_id)
       references "User"

alter table Properties
       add constraint FK63646D853B1FD7A2
       foreign key (User_id)
       references "User"

using System;
using System.Collections.Generic;

namespace Test1.Model14
{
   public class FormData
   {
       public virtual int Id { get; set; }
       public virtual DateTime? DateTime { get; set; }
       public virtual IDictionary<FormField, string> FormPropertyValues { get; set; }
   }

   public class FormField
   {
       public virtual int Id { get; set; }
       public virtual string Name { get; set; }
   }
}

using FluentNHibernate.Automapping;
using FluentNHibernate.Automapping.Alterations;

namespace Test1.Model14
{
   public class FormDataMapping : IAutoMappingOverride<FormData>
   {
       public void Override(AutoMapping<FormData> mapping)
       {
           mapping.Id(x => x.Id);
           mapping.HasMany<FormField>(x => x.FormPropertyValues)
                  .AsEntityMap("FieldId")
                  .Element("FieldValue", x => x.Type<string>().Length(500))
                  .Cascade.All();
       }
   }
}

create table "FormData" (
      Id INT IDENTITY NOT NULL,
      DateTime DATETIME null,
      primary key (Id)
   )

create table FormPropertyValues (
      FormData_id INT not null,
      FieldValue NVARCHAR(500) null,
      FieldId INT not null,
      primary key (FormData_id, FieldId)
   )

create table "FormField" (
      Id INT IDENTITY NOT NULL,
      Name NVARCHAR(255) null,
      primary key (Id)
   )

alter table FormPropertyValues
       add constraint FKB807B9C090849E
       foreign key (FormData_id)
       references "FormData"

alter table FormPropertyValues
       add constraint FKB807B97165898A
       foreign key (FieldId)
       references "FormField"

public class Service
{
   public virtual int Id { get; set; }
   public virtual string Name { get; set; }
   public virtual IList<ServiceFormField> Fields { get; set; }
   public virtual IList<ServiceFormData> Forms { get; set; }
}

public class ServiceFormField
{
   public virtual int Id { get; set; }
   public virtual string Name { get; set; }
   public virtual bool IsRequired { get; set; }
   public virtual Service Service { get; set; }
}

public class ServiceFormData
{
   public virtual int Id { get; set; }
   public virtual IDictionary<ServiceFormField, string> FormPropertyValues { get; set; }       
   public virtual DateTime? DateTime { get; set; }
   public virtual Service Service { get; set; }
}