R help - Mar 2007 - XML - can create but can't save

What's wrong with this?

library(XML)
tt <- xmlHashTree()
head <- addNode(xmlNode("head"), character(), tt)
test <- addNode(xmlNode("test", attrs=c(pi="4")), head,
tt)
tt # ok
saveXML(tt, file="test.xml") # error

The error (in Portuguese) is:
Erro em saveXML(tt, file = "test.xml") : nenhum m?todo aplic?vel 
para "saveXML"

which could translate to
Error in saveXML(tt, file = "test.xml") : no method applicable to
"saveXML"

Alberto Monteiro

I wrote:
> 
> library(XML)
> tt <- xmlHashTree()
> head <- addNode(xmlNode("head"), character(), tt)
> test <- addNode(xmlNode("test", attrs=c(pi="4")),
head, tt)
> tt # ok
> saveXML(tt, file="test.xml") # error
> 
I found a way to circumvent this error, by replacing the saveXML
line with:

sink("test.xml")
print(tt)
sink()

Alberto Monteiro