Remove decorator pattern from validator; we'll only have one decorator which invokes the subsystem.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1586 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/Validator/IdExists.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Validates that an ID field exists in the array
+ */
+class HTMLPurifier_ConfigSchema_Validator_IdExists extends HTMLPurifier_ConfigSchema_Validator
+{
+    
+    public function validate(&$arr, $interchange, $type) {
+        if (!isset($arr['ID'])) {
+            throw new HTMLPurifier_ConfigSchema_Exception('ID must exist in ' . $type);
+        }
+    }
+    
+}