title: Read, modify, write xml file in cocoa
body: <p>I'm looking for a short example/tutorial on how to read, modify one value and write an xml file using cocoa. Everything that I found is either to <a href="https://stackoverflow.com/questions/5274513/cocoa-obj-c-simple-xml-file-reader-need-help">simple</a> (just read or write) or to <a href="http://developer.apple.com/library/mac/#samplecode/XMLBrowser/Introduction/Intro.html#//apple_ref/doc/uid/DTS40008875" rel="nofollow noreferrer">complex</a> (being a full xml editor). </p>
  
  <p>This seems like a pretty standard usage scenario, so I'm hoping that there is something out there...</p>