example prefs.properties

I'm trying to use MiddleGen to generate Java classes (with XDoclet tags) 
from database. I'd like to supply my own class and attribute names and I 
know I can change prefs.properties to achieve that. I ran the Simple 
plugin and a prefs.properites file was created. However, it only contains 
relationships,

relations.customer-product_ordered.customer-has-product_ordered.enabled=true
relations.customer-product_ordered.customer-has-product_ordered.target-many=true

I tried to supply class and attribute names to replace the table and 
column names used. But obviously my syntax is not correct and those prefs 
were ignored. Can someone have some (complete) example of prefs.properties 
to show how the entries should look like? Thanks.

Andrew
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