Elements.filter 不明… >> require "hpricot" => true >> doc = Hpricot('<p>foo1</p><p>foo2</p>') => #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}> >> doc % :p => {elem <p> "foo1" </p>} >> doc.at :p => {elem <p> "foo1" </p>} >> doc % "p" => {elem <p> "foo1" </p>} >> doc % "//p" => {elem <p>…</p>