gistfile1.rb

class Sitemap
  
  attr_accessor :entries
  
  def add(array, &block)
    array.map do |a|
      if entry = block(a)
        @entries << entry
      end
    end
  end
end

sm = Sitemap.new
sm.add(paths) do |path|
  if url =~ /my_public_stuff/
    Entry.new(:path => path, :priority => 0.7, :frequency => "monthly")
  elsif url =~ /my_private_stuff/
    # don't include in sitemap
  end
end