[R] Syntax for crossed random effects in nlme

[bamsel]

Hello R users, 
I've read the posts on this topic, and had a look at the R documentation for
nlme, but I can't seem to make this work. I'd like to be able to fit a mixed
effects model with crossed random effects, but also be able to specify the
covariance matrix structure for the residuals. Here's the syntax using the
lmer function in lme4 (which doesn't currently allow alternate error
covariance structures). Does anybody know how to transform this to work with
nlme?

fit = lmer(data$DV ~ X + time + (X*time) + (1|Item_Number) + (1|Subject),
data)

Much appreciated, 
Ben Amsel
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