WSS 3.0 Custom Content Type Definition - How to add "Person or Group" Field

I want to create a content type which will have a custom field called "Attendees". But I could not find correct values for 'Type' and 'Format' parameters.

  <Field
    ID="{4a006dd6-20bf-480d-b426-1deae0fd7c2a}"
    Type="?????????????????????"
    Format="????????????????????"
    Name="Attendees"
    DisplayName="Attendees"
    StaticName="Attendees"
    Hidden="FALSE"
    Required="FALSE"
    Sealed="FALSE"
 />

Any idea? Do I need to create a custom field type? If so, how? How can I set built-in "Person or Group" field as a base?Start Free Trial