+//
+// SUVersionComparisonProtocol.h
+// Sparkle
+//
+// Created by Andy Matuschak on 12/21/07.
+// Copyright 2007 Andy Matuschak. All rights reserved.
+//
+
+#ifndef SUVERSIONCOMPARISONPROTOCOL_H
+#define SUVERSIONCOMPARISONPROTOCOL_H
+
+#import <Cocoa/Cocoa.h>
+
+/*!
+ @protocol
+ @abstract Implement this protocol to provide version comparison facilities for Sparkle.
+*/
+@protocol SUVersionComparison
+
+/*!
+ @method
+ @abstract An abstract method to compare two version strings.
+ @discussion Should return NSOrderedAscending if b > a, NSOrderedDescending if b < a, and NSOrderedSame if they are equivalent.
+*/
+- (NSComparisonResult)compareVersion:(NSString *)versionA toVersion:(NSString *)versionB; // *** MAY BE CALLED ON NON-MAIN THREAD!
+
+@end
+
+#endif