How to modify a text value in a xml?

[Milo Luo]

Hi, folks
I met a problem with xml. I can't write to the file directly, here is my
code:

f = File.open(FILE_NAME)
xml = REXML:ocument.new(f)

xml.root.each_element do |xml|
xml.each_element do |node|
#if the node name equal to Properties
if node.name == "Properties"
node.each_element do |child|
#Get the child of Properties
if child.name == "Name"
#If the text equal to English, modified to the text to ABC
if child.get_text == "English"
#What should I put here?
child.text = "ABC"
xml.write(f)
end
end
end

end
end
end

f.close

I want all the contents the same as the original file except the text of
the node "Name".
How can I do that?

Thanks very much.

BR,
Milo