diff --git a/src/Model/Checker.cs b/src/Model/Checker.cs
index 18d719e9..d3d845d3 100644
--- a/src/Model/Checker.cs
+++ b/src/Model/Checker.cs
@@ -179,6 +179,7 @@ bool LoadSchemas(XmlDocument doc, XmlSchemaSet set, SchemaResolver resolver)
                 {
                     result |= LoadSchemasForNamespace(set, resolver, sc, nsuri, root);
                 }
+                result |= LoadSchemasForNamespace(set, resolver, sc, doc.DocumentElement.NamespaceURI, root);
             }
             // Make sure all the required includes or imports are there. 
             // This is making up for a possible bug in XmlSchemaSet where it
diff --git a/src/Model/XmlHelpers.cs b/src/Model/XmlHelpers.cs
index 773466e4..faa9c9b6 100644
--- a/src/Model/XmlHelpers.cs
+++ b/src/Model/XmlHelpers.cs
@@ -219,7 +219,7 @@ public static bool IsXsiAttribute(XmlNode node)
         {
             if (node == null) return false;
             return node.NodeType == XmlNodeType.Attribute &&
-                (node.LocalName == "type" && node.NamespaceURI == "http://www.w3.org/2001/XMLSchema-instance");
+                node.NamespaceURI == "http://www.w3.org/2001/XMLSchema-instance";
         }
     }
 
diff --git a/src/UnitTests/UnitTest1.cs b/src/UnitTests/UnitTest1.cs
index 253130cd..c558bbee 100644
--- a/src/UnitTests/UnitTest1.cs
+++ b/src/UnitTests/UnitTest1.cs
@@ -123,6 +123,15 @@ Window LaunchNotepad(string filename, bool testSettings = true, bool debugMouse
             return window;
         }
 
+        AutomationWrapper ErrorList
+        {
+            get
+            {
+                AutomationWrapper grid = this.window.FindDescendant("DataGridView");
+                return grid;
+            }
+        }
+
 
         AutomationWrapper XmlTreeView
         {
@@ -690,7 +699,7 @@ public void TestIntellisense()
 
         private void NavigateErrorWithMouse()
         {
-            AutomationWrapper grid = this.window.FindDescendant("DataGridView");
+            AutomationWrapper grid = this.ErrorList;
             AutomationWrapper row = grid.FirstChild;
             row = row.NextSibling;
             Point pt = row.Bounds.Center();
@@ -1337,6 +1346,42 @@ public void TestSchemaDialog()
 
         }
 
+
+        [TestMethod]
+        [Timeout(TestMethodTimeout)]
+        public void TestXsiAttributes()
+        {
+            Trace.WriteLine("TestXsiAttributes==========================================================");
+            string testFile = _testDir + "UnitTests\\test13.xml";
+            var w = LaunchNotepad(testFile);
+
+            AutomationWrapper grid = this.ErrorList;
+            AutomationWrapper description = grid.FirstChild.NextSibling.FirstChild.NextSibling;
+            var text = description.SimpleValue;
+            if (!text.Contains("The 'last_changed' element is invalid"))
+            {
+                throw new Exception("Missing validation error");
+            }
+
+            // correct the value of the xsi:nil attribute
+            w.SendKeystrokes("{END}{RIGHT}{DOWN}{TAB}{ENTER}true{ENTER}");
+            Sleep(500);
+
+            try
+            {
+                description = grid.FirstChild.NextSibling.FirstChild.NextSibling;
+                text = description.SimpleValue;
+                throw new Exception($"Error list should now be empty, but found: {text}");
+            } 
+            catch (Exception ex)
+            {
+                if (!ex.Message.Contains("There is no next sibling"))
+                {
+                    throw new Exception($"Unexpected error: {ex.Message}");
+                }
+            }
+        }
+
         [TestMethod]
         [Timeout(TestMethodTimeout)]
         public void TestSchemaGeneration()
diff --git a/src/UnitTests/UnitTests.csproj b/src/UnitTests/UnitTests.csproj
index 27a3fa85..d6bb468c 100644
--- a/src/UnitTests/UnitTests.csproj
+++ b/src/UnitTests/UnitTests.csproj
@@ -79,6 +79,7 @@
     <Content Include="test11.xml" />
     <Content Include="test12.xml" />
     <Content Include="test10.xml" />
+    <Content Include="test13.xml" />
     <Content Include="test2.xml" />
     <Content Include="test3.xml" />
     <Content Include="test4.xml" />
@@ -126,6 +127,9 @@
     <None Include="patients.xsd">
       <SubType>Designer</SubType>
     </None>
+    <None Include="test13.xsd">
+      <SubType>Designer</SubType>
+    </None>
     <None Include="test2.xsd">
       <SubType>Designer</SubType>
     </None>
diff --git a/src/UnitTests/test13.xml b/src/UnitTests/test13.xml
new file mode 100644
index 00000000..ef08422e
--- /dev/null
+++ b/src/UnitTests/test13.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="test13.xsd">
+  <name>Chris</name>
+  <last_changed xsi:nil="false" />
+</root>
\ No newline at end of file
diff --git a/src/UnitTests/test13.xsd b/src/UnitTests/test13.xsd
new file mode 100644
index 00000000..f09087aa
--- /dev/null
+++ b/src/UnitTests/test13.xsd
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified"
+           xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           xmlns:vs="http://schemas.microsoft.com/Visual-Studio-Intellisense">
+  <xs:element name="root">    
+    <xs:complexType>
+      <xs:sequence maxOccurs="2">
+        <xs:element name="name" type="xs:string" />
+        <xs:element name="last_changed" type="xs:date" nillable="true" minOccurs="0"/>
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>
diff --git a/src/Updates/Updates.xml b/src/Updates/Updates.xml
index 0a53f477..eef0e37d 100644
--- a/src/Updates/Updates.xml
+++ b/src/Updates/Updates.xml
@@ -11,6 +11,7 @@
   </application>
   <version number="2.9.0.14">
     <bug>Fix issue #418: check setttings-file for "read-only".</bug>
+    <bug>Fix issue #398: XmlNotepad detects xml-errors at empty nillable xsd:date Elements, but xml is correct</bug>
   </version>
 	<version number="2.9.0.13">
 		<feature>Issue 409: Not able to validate XML against multiple not referenced Schemas</feature>