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digraph g {
  graph [compound = true];
  //presentation
  splines = true;
  overlap = false;
  rankdir = TB;
  subgraph cluster_generators {
    label="generators";
    style="dotted";
    generators_facebook [label="https://api.facebook.com"]
  }
  subgraph cluster_providers {
    label="providers";
      providers_facebook_page [label="FacebookPageProvider"]
      providers_facebook_pagefeed [label="FacebookPageFeedDataCollector"]
  }
  subgraph cluster_processors {
    label="processors";
    processors_facebook_activity [label="FacebookPageActivitySerializer"]
    processors_facebook_activityobject [label="FacebookPostActivitySerializer"]
  }
  persisters [label="persisters", shape="cylinder"];
  generators_facebook -> providers_facebook_page
  generators_facebook -> providers_facebook_pagefeed
  providers_facebook_page -> processors_facebook_activityobject [label="o.a.s.f.Page"]
  providers_facebook_pagefeed -> processors_facebook_activity [label="o.a.s.f.Post\no.a.s.f.Comment"]
  processors_facebook_activityobject -> persisters [label="o.a.s.p.j.Page"]
  processors_facebook_activity -> persisters [label="o.a.s.p.j.Post\no.a.s.p.j.Comment"]
}