--- /dev/null
+<?php
+
+/**
+ * Supertype for classes that define a strategy for modifying/purifying tokens.
+ *
+ * While HTMLPurifier's core purpose is fixing HTML into something proper,
+ * strategies provide plug points for extra configuration or even extra
+ * features, such as custom tags, custom parsing of text, etc.
+ */
+
+
+abstract class HTMLPurifier_Strategy
+{
+
+ /**
+ * Executes the strategy on the tokens.
+ *
+ * @param $tokens Array of HTMLPurifier_Token objects to be operated on.
+ * @param $config Configuration options
+ * @returns Processed array of token objects.
+ */
+ abstract public function execute($tokens, $config, $context);
+
+}
+
+// vim: et sw=4 sts=4