[R] two level fraction factorial design: How to input 'defining relation'?

[Mikrofoon]

I am trying to find the important factors from a two level fraction 
factorial design (2^{8-4})

I have studied the companion of vikneswaran but would really like a 
basic example of how to do this: (adapted to 8 factors):

mydata<-read.table("myfile.txt", header=T)
summary(aov(resp ~ A*B*C*D*E*F*G*H, data = mydata))

However i can't figure out how the input files are supposed to look.
(I can't find them google-wise either)

I suppose i have to enter my defining relationship in there somehow?
defining relation:  0=1234=1256=1357=2358

Kind thanks for your time.

Jan