ER - Line or Participation?


I use Dia v 0.94 on Debian GNU/Linux Sarge system.

I know a little about ER modelling of a database. I searched Internet 
about ER modelling and ER diagrams but find nothing about object named 
with Participation in Dia.

So I wondering in which case should I use a simple line and in which 
case the participation object to draw the ER diagramm of a database.

If I connect an attribute to the entity I should use the line, shouldn't 

I appreciate any advices! Thanks!

Debian Junior Project, DebianEdu, Moodle ->  :-) :-) :-) :-) :-) :-) :-) (Up to now, it is in Hungarian only.)

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