R help - Sep 2014 - extract GO results in xml format

from a list of GO term enrichment results in xml format, what is the best way to
extract term and p-value columns? Which function is the best to use? I used 
xmlToDataFrame but got
Error in `[<-.data.frame`(`*tmp*`, i, names(nodes[[i]]), value =
c("5",  :
  duplicate subscripts for columns


Look forward to your reply,

Carol

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