diff --git a/library/HTMLPurifier/HTMLDefinition.php b/library/HTMLPurifier/HTMLDefinition.php
index 7e7ac0b2..a14e6e9b 100644
--- a/library/HTMLPurifier/HTMLDefinition.php
+++ b/library/HTMLPurifier/HTMLDefinition.php
@@ -305,6 +305,9 @@ class HTMLPurifier_HTMLDefinition
         $this->info_content_sets = $this->content_sets->lookup;
         
         foreach ($this->modules as $module_i => $module) {
+            
+            $module->preProcess($this, $config);
+            
             // process element-wise definitions
             foreach ($module->info as $name => $def) {
                 // setup info
@@ -348,6 +351,9 @@ class HTMLPurifier_HTMLDefinition
             foreach($module->info_tag_transform         as $k => $v) $this->info_tag_transform[$k]      = $v;
             foreach($module->info_attr_transform_pre    as $k => $v) $this->info_attr_transform_pre[$k] = $v;
             foreach($module->info_attr_transform_post   as $k => $v) $this->info_attr_transform_post[$k]= $v;
+            
+            $module->postProcess($this, $config);
+            
         }
         
     }
diff --git a/library/HTMLPurifier/HTMLModule.php b/library/HTMLPurifier/HTMLModule.php
index 168010ae..6538952b 100644
--- a/library/HTMLPurifier/HTMLModule.php
+++ b/library/HTMLPurifier/HTMLModule.php
@@ -91,6 +91,22 @@ class HTMLPurifier_HTMLModule
      */
     function getChildDef($def) {return false;}
     
+    /**
+     * Hook method that lets module perform arbitrary operations on
+     * HTMLPurifier_HTMLDefinition before the module gets processed.
+     * @param $definition Reference to HTMLDefinition being setup
+     * @param $config Instance of HTMLPurifier_Config
+     */
+    function preProcess(&$definition, $config) {}
+    
+    /**
+     * Hook method that lets module perform arbitrary operations
+     * on HTMLPurifier_HTMLDefinition after the module gets processed.
+     * @param $definition Reference to HTMLDefinition being setup
+     * @param $config Instance of HTMLPurifier_Config
+     */
+    function postProcess(&$definition, $config) {}
+    
 }
 
 ?>
\ No newline at end of file
diff --git a/library/HTMLPurifier/HTMLModule/Legacy.php b/library/HTMLPurifier/HTMLModule/Legacy.php
index 0a7111ba..94864890 100644
--- a/library/HTMLPurifier/HTMLModule/Legacy.php
+++ b/library/HTMLPurifier/HTMLModule/Legacy.php
@@ -5,7 +5,9 @@
  * deprecated.
  * 
  * @note Not all legacy elements have been implemented yet, which
- *       is a bit of a reverse problem as compared to browsers!
+ *       is a bit of a reverse problem as compared to browsers! In
+ *       addition, this legacy module may implement a bit more than
+ *       mandated by XHTML 1.1.
  * 
  * This module can be used in combination with TransformToStrict in order
  * to transform as many deprecated elements as possible, but retain
diff --git a/library/HTMLPurifier/HTMLModule/TransformToStrict.php b/library/HTMLPurifier/HTMLModule/TransformToStrict.php
index f53a76e4..6623b6fe 100644
--- a/library/HTMLPurifier/HTMLModule/TransformToStrict.php
+++ b/library/HTMLPurifier/HTMLModule/TransformToStrict.php
@@ -27,6 +27,10 @@ class HTMLPurifier_HTMLModule_TransformToStrict extends HTMLPurifier_HTMLModule
         )
     );
     
+    var $info_attr_transform_post = array(
+        'lang' => false // placeholder
+    );
+    
     function HTMLPurifier_HTMLModule_TransformToStrict($config) {
         // deprecated tag transforms
         $this->info_tag_transform['font']   = new HTMLPurifier_TagTransform_Font();
diff --git a/library/HTMLPurifier/HTMLModule/TransformToXHTML11.php b/library/HTMLPurifier/HTMLModule/TransformToXHTML11.php
index e3f7a13e..6a3b9abf 100644
--- a/library/HTMLPurifier/HTMLModule/TransformToXHTML11.php
+++ b/library/HTMLPurifier/HTMLModule/TransformToXHTML11.php
@@ -14,7 +14,15 @@
 class HTMLPurifier_HTMLModule_TransformToXHTML11 extends HTMLPurifier_HTMLModule
 {
     
-    // unimplemented
+    var $attr_collections = array(
+        'Lang' => array(
+            'lang' => false // remove it
+        )
+    );
+    
+    var $info_attr_transform_post = array(
+        'lang' => false // remove it
+    );
     
 }