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diff --git a/lib/htmlpurifier/library/HTMLPurifier/Definition.php b/lib/htmlpurifier/library/HTMLPurifier/Definition.php
old mode 100755
new mode 100644
index a7408c97..c7f82eba
--- a/lib/htmlpurifier/library/HTMLPurifier/Definition.php
+++ b/lib/htmlpurifier/library/HTMLPurifier/Definition.php
@@ -12,6 +12,17 @@ abstract class HTMLPurifier_Definition
      */
     public $setup = false;
 
+    /**
+     * If true, write out the final definition object to the cache after
+     * setup.  This will be true only if all invocations to get a raw
+     * definition object are also optimized.  This does not cause file
+     * system thrashing because on subsequent calls the cached object
+     * is used and any writes to the raw definition object are short
+     * circuited.  See enduser-customize.html for the high-level
+     * picture.
+     */
+    public $optimized = null;
+
     /**
      * What type of definition is it?
      */