queries abt the Congo Examples

I have a few queries abt the Congo Example:

1. isPresentedBy

In the walk through, it is mentoined :

<service:isPresentedBy>
     <service:Service df:resource = "&congo;#Congo_BookBuying_Service"/>
 </service:isPresentedBy>

whereas in CongoProfile.daml it is
      <service:isPresentedBy 
rdf:resource="http://www.daml.org/services/daml-s/2001/10/Congo.daml#Congo_BookBuying_Agent" 
/>

there are two issues here:
- should it be Congo_BookBuying_Service, or Congo_BookBuying_Agent
- if it is Congo_BookBuying_Agent, then should the resource not point to 
:CongoProfile.daml coz I have not found any reference to 
Congo_BookBuying_Agent in Congo.daml

Am I missing something...?

2. SubClassing

Is it possible to subclass serviceProfile from Congo-Service.daml rather 
than from service.daml. or would it be incorrect.?

any help would be well appreciated.

Thanks..

Monika
 
-- 
 >**<>**<>**<>**<>**<>**<>**<>**<>**<>**<
Monika Solanki
De Montfort University
Software Technology Research Laboratory
Hawthorn building, H00.18
The Gateway.
Leicester LE1 9BH, UK

phone: +44 (0)116 250 6170 intern: 6170
email: monika@dmu.ac.uk <mailto:monika@dmu.ac.uk>
web: http://www.cse.dmu.ac.uk/~monika/ 
<http://www.cse.dmu.ac.uk/%7Emonika/>
 >**<>**<>**<>**<>**<>**<>**<>**<>**<>**<