diff --git a/Source/Ini/IniDocument.cs b/Source/Ini/IniDocument.cs
index bbb2d42..cfab2e9 100644
--- a/Source/Ini/IniDocument.cs
+++ b/Source/Ini/IniDocument.cs
@@ -39,6 +39,7 @@ public class IniDocument
         IniSectionCollection sections = new IniSectionCollection ();
         ArrayList initialComment = new ArrayList ();
         IniFileType fileType = IniFileType.Standard;
+        bool extended = false;
         #endregion
         
         #region Public properties
@@ -52,52 +53,108 @@ public IniFileType FileType
 
         #region Constructors
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorPath"]/docs/*' />
-        public IniDocument (string filePath)
+        public IniDocument(string filePath)
         {
             fileType = IniFileType.Standard;
-            Load (filePath);
+            Load(filePath);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorPath"]/docs/*' />
+        public IniDocument(string filePath, bool supportExtended)
+        {
+            fileType = IniFileType.Standard;
+            extended = supportExtended;
+            Load(filePath);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorPathType"]/docs/*' />
+        public IniDocument(string filePath, IniFileType type)
+        {
+            fileType = type;
+            Load(filePath);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorPathType"]/docs/*' />
-        public IniDocument (string filePath, IniFileType type)
+        public IniDocument(string filePath, IniFileType type, bool supportExtended)
         {
             fileType = type;
-            Load (filePath);
+            extended = supportExtended;
+            Load(filePath);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorTextReader"]/docs/*' />
-        public IniDocument (TextReader reader)
+        public IniDocument(TextReader reader)
         {
             fileType = IniFileType.Standard;
-            Load (reader);
+            Load(reader);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorTextReader"]/docs/*' />
+        public IniDocument(TextReader reader, bool supportExtended)
+        {
+            fileType = IniFileType.Standard;
+            extended = supportExtended;
+            Load(reader);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorTextReaderType"]/docs/*' />
-        public IniDocument (TextReader reader, IniFileType type)
+        public IniDocument(TextReader reader, IniFileType type)
         {
             fileType = type;
-            Load (reader);
+            Load(reader);
         }
-        
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorTextReaderType"]/docs/*' />
+        public IniDocument(TextReader reader, IniFileType type, bool supportExtended)
+        {
+            fileType = type;
+            extended = supportExtended;
+            Load(reader);
+        }
+
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorStream"]/docs/*' />
-        public IniDocument (Stream stream)
+        public IniDocument(Stream stream)
         {
             fileType = IniFileType.Standard;
-            Load (stream);
+            Load(stream);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorStream"]/docs/*' />
+        public IniDocument(Stream stream, bool supportExtended)
+        {
+            fileType = IniFileType.Standard;
+            extended = supportExtended;
+            Load(stream);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorStreamType"]/docs/*' />
+        public IniDocument(Stream stream, IniFileType type)
+        {
+            fileType = type;
+            Load(stream);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorStreamType"]/docs/*' />
-        public IniDocument (Stream stream, IniFileType type)
+        public IniDocument(Stream stream, IniFileType type, bool supportExtended)
         {
             fileType = type;
-            Load (stream);
+            extended = supportExtended;
+            Load(stream);
+        }
+
+        /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorIniReader"]/docs/*' />
+        public IniDocument(IniReader reader)
+        {
+            fileType = IniFileType.Standard;
+            Load(reader);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="ConstructorIniReader"]/docs/*' />
-        public IniDocument (IniReader reader)
+        public IniDocument(IniReader reader, bool supportExtended)
         {
             fileType = IniFileType.Standard;
-            Load (reader);
+            extended = supportExtended;
+            Load(reader);
         }
 
         /// <include file='IniDocument.xml' path='//Constructor[@name="Constructor"]/docs/*' />
@@ -232,6 +289,71 @@ private void LoadReader (IniReader reader)
                 // Always close the file
                 reader.Close ();
             }
+
+            MergeSections();
+        }
+
+        /// <summary>
+        /// Supports section merging where a colon is in the key, e.g. ExtendedSection : BaseSection
+        /// </summary>
+        private void MergeSections()
+        {
+            if(!extended)
+            {
+                return;
+            }
+
+            foreach (DictionaryEntry entry in sections)
+            {
+                IniSection section = (IniSection)entry.Value;
+
+                if (!section.Name.Contains(":"))
+                {
+                    continue;
+                }
+
+                var parts = section.Name.Split(new char[] { ':' });
+                var newName = parts[0].TrimEnd();
+                var extendedSectionName = parts[1].TrimStart();
+
+                if (sections[newName] != null)
+                {
+                    sections.Remove(newName);
+                }
+
+                if (sections[extendedSectionName] == null)
+                {
+                    throw new ArgumentException(String.Format("Section {0} is trying to extend section {1} but it does not exist.", newName, extendedSectionName));
+                }
+
+                IniSection baseSection = sections[extendedSectionName];
+                var baseKeys = baseSection.GetKeys();
+
+                var newSection = new IniSection(newName, section.Comment);
+
+                for (var i = 0; i < baseSection.ItemCount; i++)
+                {
+                    var item = baseSection.GetItem(i);
+
+                    if (item.Value != null)
+                    {
+                        newSection.Set(item.Name, item.Value, item.Comment);
+                    }
+                }
+
+                for (var i = 0; i < section.ItemCount; i++)
+                {
+                    var item = section.GetItem(i);
+
+                    if (item.Value != null)
+                    {
+                        newSection.Set(item.Name, item.Value, item.Comment);
+                    }
+                }
+
+                sections.Add(newSection);
+                sections.Remove(section.Name);
+            }
         }
 
         /// <summary>
diff --git a/Source/Test/Config/ConfigBaseTests.cs b/Source/Test/Config/ConfigBaseTests.cs
index 9dbb31a..62e501f 100644
--- a/Source/Test/Config/ConfigBaseTests.cs
+++ b/Source/Test/Config/ConfigBaseTests.cs
@@ -110,8 +110,11 @@ public void GetFloat ()
             IniConfigSource source = new IniConfigSource 
                                     (new StringReader (writer.ToString ()));
             IConfig config = source.Configs["Test"];
-            
-            Assert.AreEqual (494.59, config.GetFloat ("value 1"));
+
+            // Compensate for floating point storage.
+            var comparison = Math.Abs(494.59 - config.GetFloat("value 1"));
+            Assert.Less(comparison, 0.0001);
+
             Assert.AreEqual ((float)5656.2853, 
                             config.GetFloat ("Not Here", (float)5656.2853));
         }
diff --git a/Source/Test/Ini/IniDocumentTests.cs b/Source/Test/Ini/IniDocumentTests.cs
index 7b9415f..b2cb133 100644
--- a/Source/Test/Ini/IniDocumentTests.cs
+++ b/Source/Test/Ini/IniDocumentTests.cs
@@ -246,6 +246,41 @@ public void DuplicateSections ()
             Assert.IsNotNull (doc.Sections["Test"].GetValue ("value 1"));
         }
 
+        [Test]
+        public void ExtendedSections ()
+        {
+            StringWriter writer = new StringWriter();
+            writer.WriteLine("[ExtendedSection : BaseSection]");
+            writer.WriteLine("keyB = overwrittenB");
+            writer.WriteLine("keyC = valueC");
+            writer.WriteLine("[BaseSection]");
+            writer.WriteLine("keyA = valueA");
+            writer.WriteLine("keyB = valueB");
+
+            IniDocument doc = new IniDocument(new StringReader(writer.ToString()), true);
+
+            Assert.IsNotNull(doc.Sections["BaseSection"], "BaseSection is null");
+            Assert.IsNotNull(doc.Sections["ExtendedSection"], "ExtendedSection is null");
+            Assert.IsNull(doc.Sections["ExtendedSection : BaseSection"], "ExtendedSection:BaseSection is not null");
+            Assert.AreEqual(2, doc.Sections.Count);
+
+            Assert.AreEqual("valueA", doc.Sections["BaseSection"].GetValue("keyA"));
+            Assert.AreEqual("valueB", doc.Sections["BaseSection"].GetValue("keyB"));
+
+            Assert.AreEqual("valueC", doc.Sections["ExtendedSection"].GetValue("keyC"));
+            Assert.AreEqual("overwrittenB", doc.Sections["ExtendedSection"].GetValue("keyB"));
+        }
+
+        [Test]
+        [ExpectedException(ExpectedException = typeof(ArgumentException), ExpectedMessage = "Section ExtendedSection is trying to extend section BaseSectionInvalid but it does not exist", MatchType = MessageMatch.Contains)]
+        public void ExtendedSectionsValidNames()
+        {
+            StringWriter writer = new StringWriter();
+            writer.WriteLine("[ExtendedSection : BaseSectionInvalid]");
+
+            IniDocument doc = new IniDocument(new StringReader(writer.ToString()), true);
+        }
+
         [Test]
         public void DuplicateKeys ()
         {