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diff --git a/doc/uml/url_diagram.dot b/doc/uml/url_diagram.dot
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+// This is a graphviz file. To generate a diagram from this source,
+// you must first install graphviz (available from homebrew). Then run
+// the following command:
+//
+// dot -Tpng -o url_diagram.png url_diagram.dot
+
+digraph G {
+    graph [fontsize = 14, penwidth = 0, rankdir = UD];
+    node [shape = "rect"];
+    edge [fontzize = 9, style = invis];
+
+    subgraph cluster_url {
+        label = "dns-admin URL diagram";
+        color = black;
+
+        subgraph cluster_urlmisc {
+            label = "Miscellaneous";
+            penwidth = 1;
+
+            subgraph cluster_urlmiscbase {
+                label = "Default";
+                penwidth = 0;
+                urlmisc_urlmiscbase [label = "GET /\n.base"];
+            }
+
+            subgraph cluster_urlmisclocation {
+                label = "Redirector";
+                penwidth = 0;
+                urlmisc_urlmisclocation [label = "POST /location\n.location\nhandle-location"];
+            }
+        }
+
+        subgraph cluster_urldnsmisc {
+            label = "DNS miscellaneous";
+            penwidth = 1;
+
+            subgraph cluster_urldnsmiscbase {
+                label = "Base layout";
+                penwidth = 0;
+                urldnsmisc_urldnsmiscbase [label = "GET /dns\n.dns\nhandle-dns"];
+            }
+
+            subgraph cluster_urldnsmischeaders {
+                label = "Headers";
+                penwidth = 0;
+                urldnsmisc_urldnsmischeaders [label = "GET /dns/headers\n.dns-headers\nhandle-dns-headers"];
+            }
+
+            subgraph cluster_urldnsmiscloginget {
+                label = "Login form";
+                penwidth = 0;
+                urldnsmisc_urldnsmiscloginget [label = "GET /dns/login\n.dns-login-get\nhandle-dns-login-get"];
+            }
+
+            subgraph cluster_urldnsmiscloginpost {
+                label = "Login submit";
+                penwidth = 0;
+                urldnsmisc_urldnsmiscloginpost [label = "POST /dns/login\n.dns-login-post\nhandle-dns-login-post"];
+            }
+        }
+
+        subgraph cluster_urldnsapi {
+            label = "DNS API";
+            penwidth = 1;
+
+            subgraph cluster_urldnsapisearchget {
+                label = "Search form";
+                penwidth = 0;
+                urldnsapi_urldnsapisearchget [label = "GET /dns/api/search\n.dns-api-search-get\nhandle-dns-api-search-get"];
+            }
+
+            subgraph cluster_urldnsapisearchpost {
+                label = "Search submit";
+                penwidth = 0;
+                urldnsapi_urldnsapisearchpost [label = "POST /dns/api/search\n.dns-api-search-post\nhandle-dns-api-search-post"];
+            }
+
+            subgraph cluster_urldnsapiaddget {
+                label = "Add form";
+                penwidth = 0;
+                urldnsapi_urldnsapiaddget [label = "GET /dns/api/add\n.dns-api-add-get\nhandle-dns-api-add-get"];
+            }
+
+            subgraph cluster_urldnsapiaddpost {
+                label = "Add submit";
+                penwidth = 0;
+                urldnsapi_urldnsapiaddpost [label = "POST /dns/api/add\n.dns-api-add-post\nhandle-dns-api-add-post"];
+            }
+
+            subgraph cluster_urldnsapimodifyget {
+                label = "Modify form";
+                penwidth = 0;
+                urldnsapi_urldnsapimodifyget [label = "GET /dns/api/modify\n.dns-api-modify-get\nhandle-dns-api-modify-get"];
+            }
+
+            subgraph cluster_urldnsapimodifypost {
+                label = "Modify submit";
+                penwidth = 0;
+                urldnsapi_urldnsapimodifypost [label = "POST /dns/api/modify\n.dns-api-modify-post\nhandle-dns-api-modify-post"];
+            }
+
+            subgraph cluster_urldnsapideletepost {
+                label = "Delete submit";
+                penwidth = 0;
+                urldnsapi_urldnsapideletepost [label = "POST /dns/api/delete\n.dns-api-delete-post\nhandle-dns-api-delete-post"];
+            }
+
+            subgraph cluster_urldnsapittlget {
+                label = "TTL form";
+                penwidth = 0;
+                urldnsapi_urldnsapittlget [label = "GET /dns/api/ttl\n.dns-api-ttl-get\nhandle-dns-api-ttl-get"];
+            }
+
+            subgraph cluster_urldnsapittlpost {
+                label = "TTL submit";
+                penwidth = 0;
+                urldnsapi_urldnsapittlpost [label = "POST /dns/api/ttl\n.dns-api-ttl-post\nhandle-dns-api-ttl-post"];
+            }
+        }
+    }
+
+    urlmisc_urlmiscbase -> urlmisc_urlmisclocation;
+    urldnsmisc_urldnsmiscbase -> urldnsmisc_urldnsmischeaders;
+    urldnsmisc_urldnsmiscloginget -> urldnsmisc_urldnsmiscloginpost;
+    urldnsapi_urldnsapisearchget -> urldnsapi_urldnsapisearchpost;
+    urldnsapi_urldnsapiaddget -> urldnsapi_urldnsapiaddpost;
+    urldnsapi_urldnsapimodifyget -> urldnsapi_urldnsapimodifypost;
+    urldnsapi_urldnsapittlget -> urldnsapi_urldnsapittlpost;
+}