How to parse an XML file in Ruby using libxml

I wanted to try out libxml instead of nokogiri to see if its any better to parse XML files. Here's a quick program that parses the ISO codes and converts it to a csv file.

Let's say your file has the following XML structure (taken from debian ISO 3166_2 codes)

<iso_3166_2_entries>
  <iso_3166_country code="AD">
    <iso_3166_subset type="Parish">
       <iso_3166_2_entry code="AD-07"    name="Andorra la Vella" />
       <iso_3166_2_entry code="AD-02"    name="Canillo" />
       .
       .
       .
    </iso_3166_subset>
  </iso_3166_country>
</iso_3166_2_entries>

And you want to convert it to a CSV file of type Country|Type|Name....

require 'rubygems'

require 'open-uri'

require 'xml'

# You can also grab the raw XML from http source (see below)

# raw_xml = open("http://somewebsite.myfile=.xml").read

# Here we are grabbing the xml from file source

source = XML::Parser.file('myfile.xml') 

content = source.parse

countries = content.root.find('./iso_3166_country') 

countries.each do |country| 

  # Dont process empty or blank countries

  if(country.children.first != nil && country.inner_xml.strip != '')

    subsets = country.find('iso_3166_subset')

    subsets.each do |subset|

      entries =  subset.find('iso_3166_2_entry')

      entries.each do |entry|

        code = entry.attributes['code']

        name = entry.attributes['name']

        # output a tsv

        puts country.attributes['code'].strip + "\t" + subset.attributes['type'].strip + "\t" + 

              code.slice(code.index('-')+1..code.length).strip + "\t" + name.strip

      end      

    end

  end

end