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diff --git a/examples/links.rb b/examples/links.rb
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+#! /usr/bin/env ruby
+# -*- coding: UTF-8 -*-
+#
+# from the project top directory :
+#
+# run this script which builds the example system and spin it untill it's empty:
+#   $ ruby -Ilib examples/links.rb
+#
+require 'edoors'
+#
+class FileReader < Edoors::Door
+    #
+    def initialize n, p, path
+        super n, p
+        @file = File.open(path,'r')
+    end
+    #
+    def start!
+        # stimulate myself on system boot up
+        send_p require_p(Edoors::Particle), Edoors::ACT_GET
+    end
+    #
+    def receive_p p
+        if p.action==Edoors::ACT_GET
+            # stop everything if EOF reached
+            return if @file.eof?
+            p.set_data 'person', JSON.load(@file.readline)
+            # will follow the non conditional link.
+            # see Room#_send and Room#_try_links
+            send_p p
+            # stimulate myself
+            start!
+        end
+    end
+    #
+end
+#
+class Filter < Edoors::Door
+    #
+    def initialize n, p, &block
+        super n, p
+        @filter = block
+    end
+    #
+    def receive_p p
+        if p.action!=Edoors::ACT_ERROR
+            # apply the filter
+            @filter.call p
+            # will follow the conditional link.
+            # see Room#_send and Room#_try_links
+            send_p p
+        end
+    end
+    #
+end
+#
+class OutputDoor < Edoors::Door
+    #
+    def initialize n, p, t
+        super n, p
+        @title = t
+    end
+    #
+    def receive_p p
+        if p.action!=Edoors::ACT_ERROR
+            p = p.get_data('person')
+            puts "#{p['name']} is a #{p['age']} year(s) old #{@title}"
+        end
+    end
+    #
+end
+#
+if $0 == __FILE__
+    # basic setup, see hello_world.rb
+    dom0 = Edoors::Spin.new 'dom0'
+    #
+    FileReader.new 'input', dom0, './examples/data.json'
+    Filter.new('age_filter', dom0) { |p| p['old'] = (p['person']['age']>=30); p['sex']=p['person']['sex'] }
+    OutputDoor.new 'output_f', dom0, 'woman'
+    OutputDoor.new 'output_m', dom0, 'man'
+    OutputDoor.new 'output_child', dom0, 'child'
+    OutputDoor.new 'output_parent', dom0, 'parent'
+    # default link directing everything from input into age_filter
+    dom0.add_link Edoors::Link.new('input', 'age_filter')
+    # different links directing to different outputs depending on 'sex' key
+    dom0.add_link Edoors::Link.new('age_filter', 'output_f', nil, {'sex'=>'f'})
+    dom0.add_link Edoors::Link.new('age_filter', 'output_m', nil, {'sex'=>'m'})
+    # different links directing to different outputs depending on 'old' key
+    dom0.add_link Edoors::Link.new('age_filter', 'output_child', nil, {'old'=>false})
+    dom0.add_link Edoors::Link.new('age_filter', 'output_parent', nil, {'old'=>true})
+    #
+    # schedule the spinning particles untill the system cools down
+    dom0.spin!
+    #
+end
+#
+# EOF