module Hpricot::Elem::Trav

def get_attribute(name)
  a = self.raw_attributes && self.raw_attributes[name.to_s]
  a = Hpricot.uxs(a) if a
  a
end

def has_attribute?(name)
  self.raw_attributes && self.raw_attributes.has_key?(name.to_s)
end

def remove_attribute(name)
  name = name.to_s
  if has_attribute? name
    altered!
    self.raw_attributes.delete(name)
  end
end

def set_attribute(name, val)
  altered!
  self.raw_attributes ||= {}
  self.raw_attributes[name.to_s] = val.fast_xs
end

def traverse_all_element(&block)
  yield self
  children.each {|c| c.traverse_all_element(&block) }
end

def traverse_some_element(name_set, &block)
  yield self if name_set.include? self.name
  children.each {|c| c.traverse_some_element(name_set, &block) }
end