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My 'hello world' was "download a sequence from ncbi in TinySeq/XML format, parse the XML and create a new instance of 'a sequence' class". I've been suprised to find that ruby doesn't contain a decent API for parsing XML with DOM or SAX. The default API is called REXML and I found it ugly (or I may be too new to ruby to understand why it may be good). On friendfeed Adam Kraut suggested me to consider libxml-ruby (http://libxml.rubyforge.org/) or Hpricot (an xhtml parser). However I gave REXML a try by using its event-based API (but it is *not* a SAX API (namespaces are not supported) ).