>> require "hpricot" => true >> doc = Hpricot('') => #<Hpricot::Doc> >> doc.clean_path("//div/p") => "//div/p" >> doc.clean_path(" a b c ") => "a b c" >> doc.clean_path(" a b c ") => "a b c" 何に使う？</hpricot::doc>