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Handling a one-to-many relationship with value types in Fluent NHibernate
public class CustomerMap : ClassMap<Customer>
{
    public CustomerMap()
    {
        Table("Customers");

        Id(x => x.Id);
        Map(x => x.Name);
        Component(x => x.Address);
        HasMany(x => x.PhoneNumbers)
            .KeyColumn("CustomerId")
            .Cascade.All()
            .Table("CustomerPhoneNumbers");
    }
}

public class PhoneNumberMap : ClassMap<PhoneNumber>
{
    public PhoneNumberMap()
    {
        Id(x => x.Id);
        Map(x => x.Number, "PhoneNumber");
        Map(x => x.PhoneNumberType);
        Map(x => x.Description);
    }
}

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="DomainModel.PhoneNumber, DomainModel"
    table="PhoneNumberVendors" entity-name="PhoneNumberVendor">
    <id name="_id" access="field" column="PhoneNumberId">
        <generator class="assigned"/>
    </id>
    <property name= "...">
    </class>
<class name="DomainModel.PhoneNumber, DomainModel"
    table="PhoneNumberCustomers" entity-name="PhoneNumberCustomer">
    <id name="_id" access="field" column="PhoneNumberId">
        <generator class="assigned"/>
    </id>
    <property name= "...">
    </class>
</hibernate-mapping>

_session.Update("PhoneNumberCustomer", myCustomerNumber)