strict digraph OhioLINKEZproxyWebinar
{
  rankdir=RL;
  splines=ortho;
  compound=true;
  node  [style="rounded,filled,bold", shape=box, fixedsize=true, width=1.6, fontname="Arial"];


  // Node Clusters
  subgraph clusterUser { label="User Environment"; style="rounded";
    User -> Browser[label="", style="dotted", arrowhead=none];
    }

  subgraph clusterSPU { label="Starting URL"; style="rounded";
    // email
    "unknown"[shape="parallelogram", style="filled", fillcolor="yellow"];
    invisible1[style="invis"];
    invisible2[style="invis"]
      subgraph clusterSPUsub { label="Library Properties"; bgcolor="white";
        "A-Z List"[shape="rounded"];
        "LibGuides"[shape="rounded"];
        "LMS"[shape="rounded"];
        }
    { rank=same; "unknown"; invisible1; invisible2;
      }
    }

  subgraph clusterAuthentication { label="Authentication"; style="rounded";
    userdatabase1 [shape=cylinder];
    userdatabase2 [shape=cylinder];
    userdatabase3 [shape=cylinder];
    userdatabase4 [shape=cylinder];
      { rank=same;LDAP;SAML;"Sierra Patron API";
        }
    }

  subgraph clusterVendor { label="Vendor platform"; style="rounded";
    // IP recognition
    // accounts
    "Account(s)" -> "Entitlement Pool";
    }

  subgraph clusterEZproxy { label="EZproxy"; style="filled,bold";
    "Stanzas"[shape=note, fillcolor="white"];
    }

  // Bold Edges
  edge  [style=bold, fontname="Arial", weight=100]
    Browser -> "A-Z List" [lhead=clusterSPUsub];
    "A-Z List" -> Stanzas [lhead=clusterEZproxy];
    Stanzas -> "Account(s)" [lhead=clusterVendor, ltail=clusterEZproxy];

  // Thin Edges
  edge  [color="#aaaaaa", weight=1]
    Stanzas -> "Sierra Patron API" [lhead=clusterAuthentication, ltail=clusterEZproxy, style="dashed", arrowhead=none];
    LMS -> "unknown" [ltail=clusterSPUsub, style="dashed", arrowhead=none];
    SAML -> LDAP [arrowhead=none];
    LDAP -> "Sierra Patron API" [arrowhead=none];
    SAML -> userdatabase1;
    SAML -> userdatabase2;
    LDAP -> userdatabase3;
    "Sierra Patron API" -> userdatabase4;
}