nokonoko.rb

require 'rubygems'
require 'nokogiri'
require 'open-uri'
# Perform a google search
doc = Nokogiri::XML(open('http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=snp&id=7574865&report=XML&mode=xml'))

# Print out each link using a CSS selector
 doc.search('Rs Assembly Component MapLoc FxnSet').each do |link|
   puts link.attribute('mrnaAcc').to_s + '.' +link.attribute('mrnaVer').to_s
 end