Add missing parent class Definition.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1092 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Definition.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Super-class for definition datatype objects, implements serialization
+ * functions for the class.
+ */
+class HTMLPurifier_Definition
+{
+    
+    /**
+     * Has setup() been called yet?
+     */
+    var $setup = false;
+    
+    /**
+     * Sets up the definition object into the final form, something
+     * not done by the constructor
+     * @param $config HTMLPurifier_Config instance
+     */
+    function doSetup($config) {
+        trigger_error('Cannot call abstract method', E_USER_ERROR);
+    }
+    
+    /**
+     * Setup function that aborts if already setup
+     * @param $config HTMLPurifier_Config instance
+     */
+    function setup($config) {
+        if ($this->setup) return;
+        $this->setup = true;
+        $this->doSetup($config);
+    }
+    
+}
+
+?>