[R] Parse XML

[ppatel3026]

Could someone provide a link or examples of parsing XML document in R? Few
specific questions below:

For instance I can retrieve specific nodes using this:  
node <- xpathApply(xml, "//" %+% xtag, xmlValue)

1) I want to be able to retrieve parent node for this node, how can I do
this? getParentNode() does not seem to cut it. 

2) How can I retrieve children nodes for a particular node? 
3) How can I create an iterator to iterate through the whole tree? 

Thank you,
Pratt
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