R help - Feb 2010 - Convert data frame to XML-Tree

Hello,

I'd like to convert R data frames into xml-trees. I wrote (and copied)  
this little program to do this:


convertToXML <- function(df,name)
{
xml <- xmlTree("Test")
xml$addNode(name, close=FALSE)
for (i in 1:nrow(df)) {
     xml$addNode("value", close=FALSE)
     for (j in names(df)) {
         xml$addNode(j, df[i, j])
     }
     xml$closeTag()
}
xml$closeTag()
return(xml)
}

Well, now I get a warning message like
"In xmlRoot.XMLInternalDocument(currentNodes[[1]]) : empty XML
document"

if I use this function. How could this be fixed?

Thank you for your help!
Tom

T.Wunder wrote:
> 
> 
> convertToXML <- function(df,name)
> {
> xml <- xmlTree("Test")
> xml$addNode(name, close=FALSE)
> for (i in 1:nrow(df)) {
>      xml$addNode("value", close=FALSE)
>      for (j in names(df)) {
>          xml$addNode(j, df[i, j])
>      }
>      xml$closeTag()
> }
> xml$closeTag()
> return(xml)
> }
> 
> Well, now I get a warning message like
> "In xmlRoot.XMLInternalDocument(currentNodes[[1]]) : empty XML
document"
> 
> if I use this function. How could this be fixed?
> 
> 
By telling use how you "used" that function.

Dieter



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