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diff --git a/Frameworks/QueryKit/Source/QKQueryOperators.h b/Frameworks/QueryKit/Source/QKQueryOperators.h
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+//
+//  $Id: QKQueryOperators.h 3423 2011-09-12 16:50:15Z stuart02 $
+//
+//  QKQueryOperators.h
+//  sequel-pro
+//
+//  Created by Stuart Connolly (stuconnolly.com) on September 4, 2011
+//  Copyright (c) 2011 Stuart Connolly. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+//  More info at <http://code.google.com/p/sequel-pro/>
+
+/**
+ * @enum QKQueryOperator
+ *
+ * Used to specify the operator to use for a specific query parameter. 
+ *
+ * Note that this is by no means a complete list of available operators, only the most commonly used ones. 
+ * Other operators can be added as and when they are required.
+ */
+typedef enum
+{
+	QKEqualityOperator,
+	QKNotEqualOperator,
+	QKLikeOperator,
+	QKNotLikeOperator,
+	QKInOperator,
+	QKNotInOperator,
+	QKIsNullOperator,
+	QKIsNotNullOperator,
+	QKGreaterThanOperator,
+	QKLessThanOperator,
+	QKGreaterThanOrEqualOperator,
+	QKLessThanOrEqualOperator
+}
+QKQueryOperator;