How to create xml from R objects, e.g., is there a 'listToXml' function?

Question

R's XML package has an xmlToList function, but does not have the reverse, is there a function for R that will convert a list to an XML object?

I would like something like

listToXML(list('a'))

that returns

<a></a>

but the closest I can find is

library(XML)
xmlNode(list('a'))

which returns

</a>

help on this question, and understanding the conversion of R objects to XML in general appreciated (the XML package appears more focused on the use of R to read XML, with less support for creating XML).

Update... One reason that I could not figure this out is because I did not realize that the trailing '/' in <node/> indicates an empty node, equivalent to <node></node>

Answer 1

The function newXMLNode does what you need, i.e., write XML output. See the detailed help and examples in ?newXMLNode for more details. Here is a short extract:

library(XML)    
top = newXMLNode("a")
newXMLNode("b", attrs=c(x=1, y='abc'), parent=top)
newXMLNode("c", "With some text", parent=top)
top

Resulting in:

<a>
  <b x="1" y="abc"/>
  <c>With some text</c>
</a>