create to-do within dbus

Hello,

I want to realize the following task:

filter incoming emails and extract subject and content of the mail. Create on 
this base a to-do entry in the calender.

up to now script for filtering seams to be easy but I have a problem with the 
to-do entry in the calender. I managed it to create a new to-do entry in 
calender using dbus. The problem is that I have several resources, which must 
be then selected manually which is not scripts. Can someone help me with this 
issue?

Kind Regards,
Florian