diff --git a/compilers/Dot_Compiler.rb b/compilers/Dot_Compiler.rb
index 8115d9e..0c84611 100644
--- a/compilers/Dot_Compiler.rb
+++ b/compilers/Dot_Compiler.rb
@@ -19,7 +19,7 @@ def compile_domain(domain_name, problem_name, operators, methods, predicates, st
     # Operators
     operators.each {|op|
       # Header
-      domain_str << "  \"#{op[0]}\" [\n    label=\"{{#{op[0]}|#{op[1].join(' ')}}|{"
+      domain_str << "  \"#{op[0]}\" [\n    label=\"{{\\N|#{op[1].join(' ')}}|{"
       # Preconditions
       predicates_to_dot(domain_str, op[2], op[3])
       # Effects
@@ -32,21 +32,21 @@ def compile_domain(domain_name, problem_name, operators, methods, predicates, st
       method_str = ''
       decompositions = []
       met.drop(2).each_with_index {|dec,i|
-        decompositions << "<n#{i}>#{met[0]}_#{dec[0]}"
+        decompositions << "<#{i}>#{met[0]}_#{dec[0]}"
         # Label
-        method_str << "  \"label_#{met[0]}_#{dec[0]}\" [\n    label=\"{{#{met[0]}_#{dec[0]}|#{dec[1].join(' ')}}|"
+        method_str << "  \"#{met[0]}_#{dec[0]}\" [\n    label=\"{{\\N|#{dec[1].join(' ')}}|"
         # Preconditions
         predicates_to_dot(method_str, dec[2], dec[3])
         # Subtasks
         connections = ''
         dec[4].each_with_index {|subtask,j|
-          method_str << "|<n#{j}>#{subtask.join(' ')}"
-          connections << "  \"label_#{met[0]}_#{dec[0]}\":n#{j} -> \"#{subtask[0]}\"\n" if all_connections or operators.assoc(subtask[0])
+          method_str << "|<#{j}>#{subtask.join(' ')}"
+          connections << "  \"#{met[0]}_#{dec[0]}\":#{j} -> \"#{subtask[0]}\"\n" if all_connections or operators.assoc(subtask[0])
         }
         # Connections
-        method_str << "}\"\n  ]\n  \"#{met[0]}\":n#{i} -> \"label_#{met[0]}_#{dec[0]}\" [style=dotted]\n#{connections}"
+        method_str << "}\"\n  ]\n  \"#{met[0]}\":#{i} -> \"#{met[0]}_#{dec[0]}\" [style=dotted]\n#{connections}"
       }
-      domain_str << "  \"#{met[0]}\" [\n    style=bold\n    label=\"{{#{met[0]}|#{met[1].join(' ')}}|{#{decompositions.join('|')}}}\"\n  ]\n#{method_str}"
+      domain_str << "  \"#{met[0]}\" [\n    style=bold\n    label=\"{{\\N|#{met[1].join(' ')}}|{#{decompositions.join('|')}}}\"\n  ]\n#{method_str}"
     }
     domain_str << '}'
   end
diff --git a/docs/Graph.md b/docs/Graph.md
index a26f4fa..05d9339 100644
--- a/docs/Graph.md
+++ b/docs/Graph.md
@@ -33,29 +33,29 @@ digraph "basic" {
   // Operators
   node [shape=record]
   "pickup" [
-    label="{{pickup|?a}|{not (have ?a)\l|(have ?a)\l}}"
+    label="{{\N|?a}|{not (have ?a)\l|(have ?a)\l}}"
   ]
   "drop" [
-    label="{{drop|?a}|{(have ?a)\l|not (have ?a)\l}}"
+    label="{{\N|?a}|{(have ?a)\l|not (have ?a)\l}}"
   ]
   // Methods
   node [shape=Mrecord]
   "swap" [
     style=bold
-    label="{{swap|?x ?y}|{<n0>swap_case_0|<n1>swap_case_1}}"
+    label="{{\N|?x ?y}|{<0>swap_case_0|<1>swap_case_1}}"
   ]
-  "label_swap_case_0" [
-    label="{{swap_case_0|}|(have ?x)\lnot (have ?y)\l|<n0>drop ?x|<n1>pickup ?y}"
+  "swap_case_0" [
+    label="{{\N|}|(have ?x)\lnot (have ?y)\l|<0>drop ?x|<1>pickup ?y}"
   ]
-  "swap":n0 -> "label_swap_case_0" [style=dotted]
-  "label_swap_case_0":n0 -> "drop"
-  "label_swap_case_0":n1 -> "pickup"
-  "label_swap_case_1" [
-    label="{{swap_case_1|}|(have ?y)\lnot (have ?x)\l|<n0>drop ?y|<n1>pickup ?x}"
+  "swap":0 -> "swap_case_0" [style=dotted]
+  "swap_case_0":0 -> "drop"
+  "swap_case_0":1 -> "pickup"
+  "swap_case_1" [
+    label="{{\N|}|(have ?y)\lnot (have ?x)\l|<0>drop ?y|<1>pickup ?x}"
   ]
-  "swap":n1 -> "label_swap_case_1" [style=dotted]
-  "label_swap_case_1":n0 -> "drop"
-  "label_swap_case_1":n1 -> "pickup"
+  "swap":1 -> "swap_case_1" [style=dotted]
+  "swap_case_1":0 -> "drop"
+  "swap_case_1":1 -> "pickup"
 }
 ```
 
diff --git a/tests/simple.rb b/tests/simple.rb
index 1410a9f..c24ee1e 100644
--- a/tests/simple.rb
+++ b/tests/simple.rb
@@ -489,29 +489,29 @@ def test_basic_pb1_jshop_parsing_compile_to_dot
   // Operators
   node [shape=record]
   "pickup" [
-    label="{{pickup|?a}|{not (have ?a)\l|(have ?a)\l}}"
+    label="{{\N|?a}|{not (have ?a)\l|(have ?a)\l}}"
   ]
   "drop" [
-    label="{{drop|?a}|{(have ?a)\l|not (have ?a)\l}}"
+    label="{{\N|?a}|{(have ?a)\l|not (have ?a)\l}}"
   ]
   // Methods
   node [shape=Mrecord]
   "swap" [
     style=bold
-    label="{{swap|?x ?y}|{<n0>swap_case_0|<n1>swap_case_1}}"
+    label="{{\N|?x ?y}|{<0>swap_case_0|<1>swap_case_1}}"
   ]
-  "label_swap_case_0" [
-    label="{{swap_case_0|}|(have ?x)\lnot (have ?y)\l|<n0>drop ?x|<n1>pickup ?y}"
+  "swap_case_0" [
+    label="{{\N|}|(have ?x)\lnot (have ?y)\l|<0>drop ?x|<1>pickup ?y}"
   ]
-  "swap":n0 -> "label_swap_case_0" [style=dotted]
-  "label_swap_case_0":n0 -> "drop"
-  "label_swap_case_0":n1 -> "pickup"
-  "label_swap_case_1" [
-    label="{{swap_case_1|}|(have ?y)\lnot (have ?x)\l|<n0>drop ?y|<n1>pickup ?x}"
+  "swap":0 -> "swap_case_0" [style=dotted]
+  "swap_case_0":0 -> "drop"
+  "swap_case_0":1 -> "pickup"
+  "swap_case_1" [
+    label="{{\N|}|(have ?y)\lnot (have ?x)\l|<0>drop ?y|<1>pickup ?x}"
   ]
-  "swap":n1 -> "label_swap_case_1" [style=dotted]
-  "label_swap_case_1":n0 -> "drop"
-  "label_swap_case_1":n1 -> "pickup"
+  "swap":1 -> "swap_case_1" [style=dotted]
+  "swap_case_1":0 -> "drop"
+  "swap_case_1":1 -> "pickup"
 }',
       # Problem
       nil