hpricot：Hpricot::Container::Trav#find_element

>> require "hpricot"
=> true
>> doc = Hpricot('<p>foo1</p><p>foo2</p>')
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}>
>> doc.find_element('p')
=> {elem <p> "foo1" </p>}
>> doc.find_element('a')
=> nil
>> doc = Hpricot('<p>foo1</p><b>foo2</b>')
=> #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <b> "foo2" </b>}>
>> doc.find_element('p', 'b')
=> {elem <p> "foo1" </p>}
>> doc.find_element('b', 'p')
=> {elem <p> "foo1" </p>}
>> doc.find_element('a', 'b')
=> {elem <b> "foo2" </b>}

複数は出ないの？？？