diff --git a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFDivideExpressionTest.cs b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFDivideExpressionTest.cs
index 5b99b56a..2dd47bce 100644
--- a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFDivideExpressionTest.cs
+++ b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFDivideExpressionTest.cs
@@ -392,7 +392,7 @@ public void ShouldApplyExpressionWithEVAndNotCalculateResultBecauseZeroRightExpr
             DataRow row = table.NewRow();
             row["?A"] = new RDFTypedLiteral("50", RDFModelEnums.RDFDatatypes.XSD_DOUBLE).ToString();
             row["?B"] = new RDFTypedLiteral("25", RDFModelEnums.RDFDatatypes.XSD_INT).ToString();
-            row["?C"] = new RDFTypedLiteral("0", RDFModelEnums.RDFDatatypes.XSD_INT).ToString();
+            row["?C"] = RDFTypedLiteral.Zero.ToString();
             table.Rows.Add(row);
             table.AcceptChanges();
 
@@ -468,7 +468,7 @@ public void ShouldApplyExpressionWithVVAndNotCalculateResultBecauseZeroRightColu
             table.Columns.Add("?B", typeof(string));
             DataRow row = table.NewRow();
             row["?A"] = new RDFTypedLiteral("5", RDFModelEnums.RDFDatatypes.XSD_DOUBLE).ToString();
-            row["?B"] = new RDFTypedLiteral("0", RDFModelEnums.RDFDatatypes.XSD_NONNEGATIVEINTEGER).ToString();
+            row["?B"] = RDFTypedLiteral.Zero.ToString();
             table.Rows.Add(row);
             table.AcceptChanges();
 
diff --git a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFGeoDimensionExpressionTest.cs b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFGeoDimensionExpressionTest.cs
index ae190870..3fa6d847 100644
--- a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFGeoDimensionExpressionTest.cs
+++ b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFGeoDimensionExpressionTest.cs
@@ -75,7 +75,7 @@ public void ShouldApplyExpressionWithEXPAndCalculateResult()
             RDFPatternMember expressionResult = expression.ApplyExpression(table.Rows[0]);
 
             Assert.IsNotNull(expressionResult);
-            Assert.IsTrue(expressionResult.Equals(new RDFTypedLiteral("0", RDFModelEnums.RDFDatatypes.XSD_INTEGER)));
+            Assert.IsTrue(expressionResult.Equals(RDFTypedLiteral.Zero));
         }
 
         [TestMethod]
diff --git a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFLengthExpressionTest.cs b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFLengthExpressionTest.cs
index daf73dd9..492d21d6 100644
--- a/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFLengthExpressionTest.cs
+++ b/RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFLengthExpressionTest.cs
@@ -75,7 +75,7 @@ public void ShouldApplyExpressionWithExpressionAndCalculateResultOnNull()
             RDFPatternMember expressionResult = expression.ApplyExpression(table.Rows[0]);
 
             Assert.IsNotNull(expressionResult);
-            Assert.IsTrue(expressionResult.Equals(new RDFTypedLiteral("0", RDFModelEnums.RDFDatatypes.XSD_INTEGER)));
+            Assert.IsTrue(expressionResult.Equals(RDFTypedLiteral.Zero));
         }
 
         [TestMethod]
diff --git a/RDFSharp/Model/RDFGraph.cs b/RDFSharp/Model/RDFGraph.cs
index 1909c29c..ae14f24e 100644
--- a/RDFSharp/Model/RDFGraph.cs
+++ b/RDFSharp/Model/RDFGraph.cs
@@ -201,9 +201,7 @@ public RDFGraph AddContainer(RDFContainer container)
             if (container != null)
             {
                 //Reify the container to get its graph representation
-                RDFGraph reifCont = container.ReifyContainer();
-                //Iterate on the constructed triples
-                foreach (RDFTriple t in reifCont)
+                foreach (RDFTriple t in container.ReifyContainer())
                     AddTriple(t);
             }
             return this;
@@ -217,9 +215,7 @@ public RDFGraph AddCollection(RDFCollection collection)
             if (collection != null)
             {
                 //Reify the collection to get its graph representation
-                RDFGraph reifColl = collection.ReifyCollection();
-                //Iterate on the constructed triples
-                foreach (RDFTriple t in reifColl)
+                foreach (RDFTriple t in collection.ReifyCollection())
                     AddTriple(t);
             }
             return this;
diff --git a/RDFSharp/Model/RDFNamespaceRegister.cs b/RDFSharp/Model/RDFNamespaceRegister.cs
index 74374343..0b872f5a 100644
--- a/RDFSharp/Model/RDFNamespaceRegister.cs
+++ b/RDFSharp/Model/RDFNamespaceRegister.cs
@@ -157,7 +157,7 @@ public static void AddNamespace(RDFNamespace nSpace)
         public static void RemoveByUri(string uri)
         {
             if (uri != null)
-                Instance.Register.RemoveAll(ns => ns.NamespaceUri.ToString().Equals(uri.Trim(), StringComparison.OrdinalIgnoreCase));
+                Instance.Register.RemoveAll(ns => string.Equals(ns.NamespaceUri.ToString(), uri.Trim(), StringComparison.OrdinalIgnoreCase));
         }
 
         /// <summary>
@@ -166,7 +166,7 @@ public static void RemoveByUri(string uri)
         public static void RemoveByPrefix(string prefix)
         {
             if (prefix != null)
-                Instance.Register.RemoveAll(ns => ns.NamespacePrefix.Equals(prefix.Trim(), StringComparison.OrdinalIgnoreCase));
+                Instance.Register.RemoveAll(ns => string.Equals(ns.NamespacePrefix, prefix.Trim(), StringComparison.OrdinalIgnoreCase));
         }
 
         /// <summary>
@@ -176,7 +176,7 @@ public static RDFNamespace GetByUri(string uri, bool enablePrefixCCService = fal
         {
             if (uri != null)
             {
-                RDFNamespace result = Instance.Register.Find(ns => ns.NamespaceUri.ToString().Equals(uri.Trim(), StringComparison.OrdinalIgnoreCase));
+                RDFNamespace result = Instance.Register.Find(ns => string.Equals(ns.NamespaceUri.ToString(), uri.Trim(), StringComparison.OrdinalIgnoreCase));
                 if (result == null && enablePrefixCCService)
                     result = LookupPrefixCC(uri.Trim().TrimEnd(new char[] { '#' }), 2);
                 return result;
@@ -191,7 +191,7 @@ public static RDFNamespace GetByPrefix(string prefix, bool enablePrefixCCService
         {
             if (prefix != null)
             {
-                RDFNamespace result = Instance.Register.Find(ns => ns.NamespacePrefix.Equals(prefix.Trim(), StringComparison.OrdinalIgnoreCase));
+                RDFNamespace result = Instance.Register.Find(ns => string.Equals(ns.NamespacePrefix, prefix.Trim(), StringComparison.OrdinalIgnoreCase));
                 if (result == null && enablePrefixCCService)
                     result = LookupPrefixCC(prefix.Trim(), 1);
                 return result;
@@ -213,10 +213,10 @@ internal static RDFNamespace LookupPrefixCC(string data, int lookupMode)
                 {
                     string response = webclient.DownloadString(lookupString);
                     string prefix = response.Split('\t')[0];
-                    string nspace = response.Split('\t')[1].TrimEnd(new char[] { '\n' });
+                    string nspace = response.Split('\t')[1].TrimEnd(Environment.NewLine);
                     RDFNamespace result = new RDFNamespace(prefix, nspace);
 
-                    //Also add the namespace to the register, to avoid future lookups
+                    //Also add the namespace to the register (to avoid future lookups)
                     AddNamespace(result);
 
                     //Return the found result
diff --git a/RDFSharp/Model/RDFTypedLiteral.cs b/RDFSharp/Model/RDFTypedLiteral.cs
index e3087e26..d726e373 100644
--- a/RDFSharp/Model/RDFTypedLiteral.cs
+++ b/RDFSharp/Model/RDFTypedLiteral.cs
@@ -36,6 +36,11 @@ public class RDFTypedLiteral : RDFLiteral
         /// Represents an handy typed literal for boolean False
         /// </summary>
         public static readonly RDFTypedLiteral False = new RDFTypedLiteral("false", RDFModelEnums.RDFDatatypes.XSD_BOOLEAN);
+
+        /// <summary>
+        /// Represents an handy typed literal for integer Zero
+        /// </summary>
+        public static readonly RDFTypedLiteral Zero = new RDFTypedLiteral("0", RDFModelEnums.RDFDatatypes.XSD_INTEGER);
         #endregion
 
         #region Ctors