Index: trunk/core/kernel/constants.php
===================================================================
diff -u -N -r6656 -r6751
--- trunk/core/kernel/constants.php	(.../constants.php)	(revision 6656)
+++ trunk/core/kernel/constants.php	(.../constants.php)	(revision 6751)
@@ -1,13 +1,21 @@
 <?php
 
-	// kDBList filtering
+	// kDBList filter types (then, types are divided into classes)
 	define('HAVING_FILTER', 1);
 	define('WHERE_FILTER', 2);
 	define('AGGREGATE_FILTER', 3);
 
+	// kDBList filter classes
+	define('FLT_SYSTEM',	1);	// System Having/Where filter [AND]
+	define('FLT_NORMAL',	2);	// User Having/Where filter [OR]
+	define('FLT_SEARCH',	3);	// User "Search" Having/Where filter [OR]
+	define('FLT_VIEW',		4);	// User "View Menu" Having/Where filter [AND]
+	define('FLT_CUSTOM',	5); // Custom fields (above) grid columns [AND]
+	
+	// kMultipleFilter types
 	define('FLT_TYPE_AND',	'AND');
 	define('FLT_TYPE_OR',	'OR');
-
+	
 	// item statuses
 	safeDefine('STATUS_DISABLED', 0);
 	safeDefine('STATUS_ACTIVE', 1);