I have a custom class that encapsulates the identifier. How do I do the id mapping so that the generator accesses the Id property of UniqueIdentifier as below?

<class name="Person" table="Persons">
<id name="Id" access="nosetter.camelcase" column="Id">
<generator class="guid" />
</id>
</class>

My business object:

public class Person
{
private UniqueIdentifier id;
public UniqueIdentifier Id
{
get { return id; }
}
}

public class UniqueIdentifier
{
private Guid id;
public Guid Id
{
get{ return id; }
set{ id = value; }
}
}

You will probably need to create a custom generator for that.