hpricot：Hpricot::Traverse#next, #next_node

>> 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').next
=> {elem <p> "foo2" </p>}
>> doc = Hpricot('<div><p><b>foo1</b></p><p>foo2</p></div><p>foo3</p>')
=> #<Hpricot::Doc {elem <div> {elem <p> {elem <b> "foo1" </b>} </p>} {elem <p> "foo2" </p>} </div>} {elem <p> "foo3" </p>}>
>> doc.at('div').next
=> {elem <p> "foo3" </p>}