hpricot：Hpricot::Traverse#after

>> require "hpricot"
=> true
>> doc = Hpricot('<p>foo1</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}>
>> doc.at("p").after('')
=> nil
>> doc.at("p").after('<div>foo</div>')
=> [{elem <div> "foo" </div>}]
>> doc
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <div> "foo" </div>} {elem <p> "foo2" </p>}>
>> doc = Hpricot('<p>foo1</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}>
>> doc.search("p")[1].after('<div>foo</div>')
=> [{elem <div> "foo" </div>}]
>> doc
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>} {elem <div> "foo" </div>}>

Hpricot::Traverse#after 呼べているかな？