diff --git a/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/DataConstraintModel.java b/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/DataConstraintModel.java
index 555f07d..26205c8 100644
--- a/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/DataConstraintModel.java
+++ b/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/DataConstraintModel.java
@@ -67,16 +67,22 @@
 			Constant arg1 = (Constant) args.get(1);
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
-			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+			if (arg0.getType() != null && arg1.getType() != null) {
+				if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+					return new Constant(Double.toString(Double.parseDouble(sArg0) + Double.parseDouble(sArg1)), typeDouble);
+				} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
+					return new Constant(Float.toString(Float.parseFloat(sArg0) + Float.parseFloat(sArg1)), typeFloat);
+				} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
+					return new Constant(Long.toString(Long.parseLong(sArg0) + Long.parseLong(sArg1)), typeLong);
+				} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(Integer.parseInt(sArg0) + Integer.parseInt(sArg1)), typeInt);
+				}
+			}
+			if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
 				return new Constant(Double.toString(Double.parseDouble(sArg0) + Double.parseDouble(sArg1)), typeDouble);
-			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
-				return new Constant(Float.toString(Float.parseFloat(sArg0) + Float.parseFloat(sArg1)), typeFloat);
-			} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
-				return new Constant(Long.toString(Long.parseLong(sArg0) + Long.parseLong(sArg1)), typeLong);
-			} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+			} else {
 				return new Constant(Integer.toString(Integer.parseInt(sArg0) + Integer.parseInt(sArg1)), typeInt);
 			}
-			return new Constant(Integer.toString(Integer.parseInt(sArg0) + Integer.parseInt(sArg1)));
 		}
 	});
 	public static final Symbol mul = new Symbol(Parser.MUL, 2, Symbol.Type.INFIX, new Symbol.ICalculator() {
@@ -92,16 +98,22 @@
 			Constant arg1 = (Constant) args.get(1);
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
-			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+			if (arg0.getType() != null && arg1.getType() != null) {
+				if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+					return new Constant(Double.toString(Double.parseDouble(sArg0) * Double.parseDouble(sArg1)), typeDouble);
+				} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
+						return new Constant(Float.toString(Float.parseFloat(sArg0) * Float.parseFloat(sArg1)), typeFloat);
+				} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
+					return new Constant(Long.toString(Long.parseLong(sArg0) * Long.parseLong(sArg1)), typeLong);
+				} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(Integer.parseInt(sArg0) * Integer.parseInt(sArg1)), typeInt);
+				}
+			}
+			if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
 				return new Constant(Double.toString(Double.parseDouble(sArg0) * Double.parseDouble(sArg1)), typeDouble);
-			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
-				return new Constant(Float.toString(Float.parseFloat(sArg0) * Float.parseFloat(sArg1)), typeFloat);
-			} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
-				return new Constant(Long.toString(Long.parseLong(sArg0) * Long.parseLong(sArg1)), typeLong);
-			} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+			} else {
 				return new Constant(Integer.toString(Integer.parseInt(sArg0) * Integer.parseInt(sArg1)), typeInt);
 			}
-			return new Constant(Integer.toString(Integer.parseInt(sArg0) * Integer.parseInt(sArg1)));
 		}
 	});
 	public static final Symbol sub = new Symbol(Parser.SUB, 2, Symbol.Type.INFIX, new Symbol.ICalculator() {
@@ -117,16 +129,22 @@
 			Constant arg1 = (Constant) args.get(1);
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
-			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+			if (arg0.getType() != null && arg1.getType() != null) {
+				if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+					return new Constant(Double.toString(Double.parseDouble(sArg0) - Double.parseDouble(sArg1)), typeDouble);
+				} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
+					return new Constant(Float.toString(Float.parseFloat(sArg0) - Float.parseFloat(sArg1)), typeFloat);
+				} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
+					return new Constant(Long.toString(Long.parseLong(sArg0) - Long.parseLong(sArg1)), typeLong);
+				} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(Integer.parseInt(sArg0) - Integer.parseInt(sArg1)), typeInt);
+				}
+			}
+			if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
 				return new Constant(Double.toString(Double.parseDouble(sArg0) - Double.parseDouble(sArg1)), typeDouble);
-			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
-				return new Constant(Float.toString(Float.parseFloat(sArg0) - Float.parseFloat(sArg1)), typeFloat);
-			} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
-				return new Constant(Long.toString(Long.parseLong(sArg0) - Long.parseLong(sArg1)), typeLong);
-			} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+			} else {
 				return new Constant(Integer.toString(Integer.parseInt(sArg0) - Integer.parseInt(sArg1)), typeInt);
 			}
-			return new Constant(Integer.toString(Integer.parseInt(sArg0) - Integer.parseInt(sArg1)));
 		}
 	});
 	public static final Symbol div = new Symbol(Parser.DIV, 2, Symbol.Type.INFIX, new Symbol.ICalculator() {
@@ -142,16 +160,22 @@
 			Constant arg1 = (Constant) args.get(1);
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
-			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+			if (arg0.getType() != null && arg1.getType() != null) {
+				if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
+					return new Constant(Double.toString(Double.parseDouble(sArg0) / Double.parseDouble(sArg1)), typeDouble);
+				} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
+					return new Constant(Float.toString(Float.parseFloat(sArg0) / Float.parseFloat(sArg1)), typeFloat);
+				} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
+					return new Constant(Long.toString(Long.parseLong(sArg0) / Long.parseLong(sArg1)), typeLong);
+				} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(Integer.parseInt(sArg0) / Integer.parseInt(sArg1)), typeInt);
+				}
+			}
+			if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
 				return new Constant(Double.toString(Double.parseDouble(sArg0) / Double.parseDouble(sArg1)), typeDouble);
-			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
-				return new Constant(Float.toString(Float.parseFloat(sArg0) / Float.parseFloat(sArg1)), typeFloat);
-			} else if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
-				return new Constant(Long.toString(Long.parseLong(sArg0) / Long.parseLong(sArg1)), typeLong);
-			} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+			} else {
 				return new Constant(Integer.toString(Integer.parseInt(sArg0) / Integer.parseInt(sArg1)), typeInt);
 			}
-			return new Constant(Integer.toString(Integer.parseInt(sArg0) / Integer.parseInt(sArg1)));
 		}
 	});
 	public static final Symbol mod = new Symbol(Parser.MOD, 2, Symbol.Type.INFIX, "%", Symbol.Type.INFIX, new Symbol.ICalculator() {
@@ -167,10 +191,12 @@
 			Constant arg1 = (Constant) args.get(1);
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
-			if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
-				return new Constant(Long.toString(Long.parseLong(sArg0) % Long.parseLong(sArg1)), typeLong);
-			} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
-				return new Constant(Integer.toString(Integer.parseInt(sArg0) % Integer.parseInt(sArg1)), typeInt);
+			if (arg0.getType() != null && arg1.getType() != null) {
+				if (arg0.getType().equals(typeLong) || arg1.getType().equals(typeLong)) {
+					return new Constant(Long.toString(Long.parseLong(sArg0) % Long.parseLong(sArg1)), typeLong);
+				} else if (arg0.getType().equals(typeInt) || arg1.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(Integer.parseInt(sArg0) % Integer.parseInt(sArg1)), typeInt);
+				}
 			}
 			return new Constant(Integer.toString(Integer.parseInt(sArg0) % Integer.parseInt(sArg1)));
 		}
@@ -183,16 +209,22 @@
 			}
 			Constant arg = (Constant) args.get(0);
 			String sArg = arg.getSymbol().toString();
-			if (arg.getType().equals(typeDouble)) {
+			if (arg.getType() != null) {
+				if (arg.getType().equals(typeDouble)) {
+					return new Constant(Double.toString(-Double.parseDouble(sArg)), typeDouble);
+				} else if (arg.getType().equals(typeFloat)) {
+					return new Constant(Float.toString(-Float.parseFloat(sArg)), typeFloat);
+				} else if (arg.getType().equals(typeLong)) {
+					return new Constant(Long.toString(-Long.parseLong(sArg)), typeLong);
+				} else if (arg.getType().equals(typeInt)) {
+					return new Constant(Integer.toString(-Integer.parseInt(sArg)), typeInt);
+				}
+			}
+			if (sArg.contains(Parser.DOT)) {
 				return new Constant(Double.toString(-Double.parseDouble(sArg)), typeDouble);
-			} else if (arg.getType().equals(typeFloat)) {
-				return new Constant(Float.toString(-Float.parseFloat(sArg)), typeFloat);
-			} else if (arg.getType().equals(typeLong)) {
-				return new Constant(Long.toString(-Long.parseLong(sArg)), typeLong);
-			} else if (arg.getType().equals(typeInt)) {
+			} else {
 				return new Constant(Integer.toString(-Integer.parseInt(sArg)), typeInt);
 			}
-			return new Constant(Integer.toString(-Integer.parseInt(sArg)));
 		}
 	});
 	public static final Symbol eq = new Symbol(Parser.EQ, 2, Symbol.Type.INFIX, new Symbol.IImplGenerator() {
@@ -220,6 +252,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) == Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) == Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) == Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -263,6 +302,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) != Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) != Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) != Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -295,6 +341,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) > Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) > Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) > Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -325,6 +378,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) < Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) < Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) < Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -355,6 +415,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) >= Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) >= Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) >= Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -385,6 +452,13 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) {
+				if (sArg0.contains(Parser.DOT) || sArg1.contains(Parser.DOT)) {
+					result = Double.parseDouble(sArg0) <= Double.parseDouble(sArg1);
+				} else {
+					result = Integer.parseInt(sArg0) <= Integer.parseInt(sArg1);
+				}
+			}
 			if (arg0.getType().equals(typeDouble) || arg1.getType().equals(typeDouble)) {
 				result = (Double.parseDouble(sArg0) <= Double.parseDouble(sArg1));
 			} else if (arg0.getType().equals(typeFloat) || arg1.getType().equals(typeFloat)) {
@@ -415,6 +489,7 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) return null;
 			if (arg0.getType().equals(typeBoolean) || arg1.getType().equals(typeBoolean)) {
 				result = (Boolean.parseBoolean(sArg0) && Boolean.parseBoolean(sArg1));
 			}
@@ -439,6 +514,7 @@
 			String sArg0 = arg0.getSymbol().toString();
 			String sArg1 = arg1.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null || arg1.getType() == null) return null;
 			if (arg0.getType().equals(typeBoolean) || arg1.getType().equals(typeBoolean)) {
 				result = (Boolean.parseBoolean(sArg0) || Boolean.parseBoolean(sArg1));
 			}
@@ -458,6 +534,7 @@
 			Constant arg0 = (Constant) args.get(0);
 			String sArg0 = arg0.getSymbol().toString();
 			boolean result = false;
+			if (arg0.getType() == null) return null;
 			if (arg0.getType().equals(typeBoolean)) {
 				result = !Boolean.parseBoolean(sArg0);
 			}