--- /dev/null
+<?php
+
+/**
+ * Represents a directive ID in the interchange format.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Id
+{
+
+ /**
+ * @type string
+ */
+ public $key;
+
+ /**
+ * @param string $key
+ */
+ public function __construct($key)
+ {
+ $this->key = $key;
+ }
+
+ /**
+ * @return string
+ * @warning This is NOT magic, to ensure that people don't abuse SPL and
+ * cause problems for PHP 5.0 support.
+ */
+ public function toString()
+ {
+ return $this->key;
+ }
+
+ /**
+ * @return string
+ */
+ public function getRootNamespace()
+ {
+ return substr($this->key, 0, strpos($this->key, "."));
+ }
+
+ /**
+ * @return string
+ */
+ public function getDirective()
+ {
+ return substr($this->key, strpos($this->key, ".") + 1);
+ }
+
+ /**
+ * @param string $id
+ * @return HTMLPurifier_ConfigSchema_Interchange_Id
+ */
+ public static function make($id)
+ {
+ return new HTMLPurifier_ConfigSchema_Interchange_Id($id);
+ }
+}
+
+// vim: et sw=4 sts=4