Rails - Aug 2006 - help needed in xml feed

hello gentlemen

  if i use the below code in model( I want this code to be in model only 
not in views)

 xml = Builder::XmlMarkup.new( :target => $stdout, :indent => 2 )
	xml.instruct! :xml, :version => "1.1", :encoding =>
"UTF-8"
 xml.avails {
		xml.dump("hai")
		xml.dump1("hello")
		}

  how can i retrieve this code & feed this code into  xml file (say 
"demo.xml")

 plz explain with example

advance thx
Have a pleasant day

narayana

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