hpricot：Hpricot::Container::Trav#each_child

everyday Ruby 
>> require "hpricot"
=> true
>> doc = Hpricot('<p><b>foo1</b>hoge</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> {elem <b> "foo1" </b>} "hoge" </p>} {elem <p> "foo2" </p>}>
>> doc.each_child {|x| p x}
{elem <p> {elem <b> "foo1" </b>} "hoge" </p>}
{elem <p> "foo2" </p>}
=> nil
>> doc.at('p').each_child {|x| p x}
{elem <b> "foo1" </b>}
"hoge"
=> nil