Index: conf/testExtendedXMLConfigurationProvider.xml
===================================================================
--- conf/testExtendedXMLConfigurationProvider.xml	(revision 712227)
+++ conf/testExtendedXMLConfigurationProvider.xml	(working copy)
@@ -8,7 +8,8 @@
     </result>
     <providers>
       <provider config-tag="test"
-                config-class="org.apache.commons.configuration.DefaultConfigurationBuilder$FileConfigurationProvider"/>
+                config-class="org.apache.commons.configuration.DefaultConfigurationBuilder$XMLConfigurationProvider"
+                configurationClass="org.apache.commons.configuration.TestDefaultConfigurationBuilder$ExtendedXMLConfiguration"/>
     </providers>
     <combiner>
       <override>
@@ -26,10 +27,10 @@
       refreshDelay="10000"/>
   </properties>
   <!-- Fetch the file name from a variable -->
-  <xml fileName="${test_file_xml}" config-name="xml">
+  <test fileName="${test_file_xml}" config-name="xml">
     <expressionEngine config-class="org.apache.commons.configuration.tree.DefaultExpressionEngine"
       propertyDelimiter="/" indexStart="[" indexEnd="]"/>
-  </xml>
+  </test>
   <additional>
     <xml config-name="combiner1" fileName="${test_file_combine}"/>  -->
     <xml config-name="combiner2" fileName="testcombine2.xml"/>

Property changes on: conf/testExtendedXMLConfigurationProvider.xml
___________________________________________________________________
Name: svn:mime-type
   + text/xml
Name: svn:keywords
   + Date Author Id Revision HeadURL
Name: svn:mergeinfo
   + 
Name: svn:eol-style
   + native

Index: src/test/org/apache/commons/configuration/TestDefaultConfigurationBuilder.java
===================================================================
--- src/test/org/apache/commons/configuration/TestDefaultConfigurationBuilder.java	(revision 712227)
+++ src/test/org/apache/commons/configuration/TestDefaultConfigurationBuilder.java	(working copy)
@@ -61,6 +61,9 @@
     private static final File PROVIDER_FILE = new File(
             "conf/testConfigurationProvider.xml");
 
+    private static final File EXTENDED_PROVIDER_FILE = new File(
+            "conf/testExtendedXMLConfigurationProvider.xml");
+
     /** Constant for the name of an optional configuration.*/
     private static final String OPTIONAL_NAME = "optionalConfig";
 
@@ -775,6 +778,22 @@
         assertNotNull("Provider 'test' not registered", provider);
     }
 
+        /**
+     * Tests loading a configuration definition file that defines new providers.
+     */
+    public void testExtendedXMLConfigurationProvider() throws ConfigurationException
+    {
+        factory.setFile(EXTENDED_PROVIDER_FILE);
+        CombinedConfiguration cc = factory.getConfiguration(true);
+        DefaultConfigurationBuilder.ConfigurationProvider provider = factory
+                .providerForTag("test");
+        assertNotNull("Provider 'test' not registered", provider);
+        Configuration config = cc.getConfiguration("xml");
+        assertNotNull("Test configuration not present", config);
+        assertTrue("Configuration is not ExtendedXMLConfiguration, is " +
+                config.getClass().getName(), config instanceof ExtendedXMLConfiguration);
+    }
+
     /**
      * A specialized combined configuration implementation used for testing
      * custom result classes.
@@ -796,5 +815,13 @@
             return super.getProperty(key);
         }
     }
+
+    public static class ExtendedXMLConfiguration extends XMLConfiguration
+    {
+        public ExtendedXMLConfiguration()
+        {
+        }
+
+    }
 }
 
Index: src/java/org/apache/commons/configuration/DefaultConfigurationBuilder.java
===================================================================
--- src/java/org/apache/commons/configuration/DefaultConfigurationBuilder.java	(revision 712227)
+++ src/java/org/apache/commons/configuration/DefaultConfigurationBuilder.java	(working copy)
@@ -1282,7 +1282,7 @@
      * it will copy all entity IDs that have been registered for the
      * configuration builder to the new XML configuration before it is loaded.
      */
-    static class XMLConfigurationProvider extends FileConfigurationProvider
+    public static class XMLConfigurationProvider extends FileConfigurationProvider
     {
         /**
          * Creates a new instance of <code>XMLConfigurationProvider</code>.