diff --git a/ReadMe.txt b/ReadMe.txt
index 5816e31..f537784 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -111,6 +111,7 @@ NOTES:
 
 TODO LIST:
 
+- Add redefine (for external schema) and restrictions.
 - Add an icon "Go to Diagram" on tool bar, to help working with lot of includes (Majo).
 - Show/hide group elements in the settings (Mario M.).
 - Font look blurry on Windows, add default font size in the settings (Mario M.).
@@ -137,7 +138,7 @@ TODO LIST:
 
 CHANGES:
 
-version 1.2alpha (2017-02-??)
+version 1.2alpha (2017-09-??)
 - Add infer XSD from XML menu.
 - Fix a null reference exception in the documentation (Thanks Mario M.).
 - Add the namespace in the command line option -r (Thanks Kevin).
@@ -145,6 +146,7 @@ version 1.2alpha (2017-02-??)
 - Add multi-(language) documentation (https://github.com/dgis/xsddiagram/issues/8).
 - Fix the URL escaping in the import (https://github.com/dgis/xsddiagram/issues/11).
 - Add the attributes of an element with the option -a for text output only.
+- Fix bad case sensitivity to reference the elements (https://github.com/dgis/xsddiagram/issues/15).
 
 version 1.1 (2016-07-08)
 - Fix SVG page size.
@@ -268,7 +270,7 @@ version 0.1 (2006-09-14)
 
 LICENSE:
 
-Copyright (c) 2006-2016 Regis COSNIER, All Rights Reserved.
+Copyright (c) 2006-2017 Regis COSNIER, All Rights Reserved.
 
 This program is free software and may be distributed
 according to the terms of the GNU General Public License (GPL).
diff --git a/Tests/issues/15/domicoudin.xsd b/Tests/issues/15/domicoudin.xsd
new file mode 100644
index 0000000..0ffb331
--- /dev/null
+++ b/Tests/issues/15/domicoudin.xsd
@@ -0,0 +1,36 @@
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
+	<xs:element name="x">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element ref="a"/>
+				<xs:element ref="b"/>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="a">
+		<xs:complexType>
+			<xs:sequence>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="b">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element ref="A"/>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="A">
+		<xs:complexType>
+			<xs:sequence>
+				<xs:element ref="c"/>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+	<xs:element name="c">
+		<xs:complexType>
+			<xs:sequence>
+			</xs:sequence>
+		</xs:complexType>
+	</xs:element>
+</xs:schema>
diff --git a/XSDDiagram.exe b/XSDDiagram.exe
index 5fc2e2c..36cbb36 100644
Binary files a/XSDDiagram.exe and b/XSDDiagram.exe differ
diff --git a/XSDDiagramConsole.exe b/XSDDiagramConsole.exe
index f5b987a..5145042 100644
Binary files a/XSDDiagramConsole.exe and b/XSDDiagramConsole.exe differ
diff --git a/XSDDiagrams/Parsing/Schema.cs b/XSDDiagrams/Parsing/Schema.cs
index 025e9c9..35d39a6 100644
--- a/XSDDiagrams/Parsing/Schema.cs
+++ b/XSDDiagrams/Parsing/Schema.cs
@@ -25,8 +25,8 @@ namespace XSDDiagram
         private static XmlSerializer schemaSerializer = new XmlSerializer(typeof(XMLSchema.schema));
 
         private List<XSDObject> elements = new List<XSDObject>();
-        private Dictionary<string, XSDObject> hashtableElementsByName =  new Dictionary<string, XSDObject>(StringComparer.OrdinalIgnoreCase);
-        private Dictionary<string, object> hashtableAttributesByName = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
+        private Dictionary<string, XSDObject> hashtableElementsByName = new Dictionary<string, XSDObject>(); // StringComparer.OrdinalIgnoreCase);
+        private Dictionary<string, object> hashtableAttributesByName = new Dictionary<string, object>(); // StringComparer.OrdinalIgnoreCase);
         private XSDObject firstElement = null;
         private List<string> loadError = new List<string>();
         private List<string> listOfXsdFilename = new List<string>();
diff --git a/XSDDiagrams/Rendering/Diagram.cs b/XSDDiagrams/Rendering/Diagram.cs
index c6b6707..2ee1053 100644
--- a/XSDDiagrams/Rendering/Diagram.cs
+++ b/XSDDiagrams/Rendering/Diagram.cs
@@ -57,7 +57,7 @@ namespace XSDDiagram.Rendering
             _alignement = DiagramAlignement.Center;
             _rootElements = new List<DiagramItem>();
             _selectedElement = null;
-            _elementsByName = new Dictionary<string, XSDObject>(StringComparer.OrdinalIgnoreCase);
+            _elementsByName = new Dictionary<string, XSDObject>(); // StringComparer.OrdinalIgnoreCase);
         }
 
         #endregion