hpricot：Hpricot::Traverse#to_html, #to_s

everyday Ruby 
>> require "hpricot"
=> true
>> doc = Hpricot('<p><b>foo1</b></p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> {elem <b> "foo1" </b>} </p>} {elem <p> "foo2" </p>}>
>> doc.at('p').to_html
=> "<p><b>foo1</b></p>"
>> doc.search('p')[1].to_html
=> "<p>foo2</p>"