glmm and overall goodness of fit

Hi,

exist in R any glmm function that have any tools for test for overall goodness 
of fit? 
True measures of overall goodness of fit may be difficult to formulate for
such mixed models. Relative goodness of fit (as compared to glm) is
available through the AIC produced by my glmm function.
  Cheers, Jim
Thanks
Ronaldo
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