# File lib/ruport/data/feeder.rb, line 80
  def <<(element)  
    feed_element = data.feed_element(element)
     
    @constraints.each do |type,block|
      if type == :filter
        return self unless block[feed_element]
      else
        block[feed_element]
      end
    end
    
    data << feed_element
    return self
  end