Index: src/exceptions/Makefile
==================================================================
--- src/exceptions/Makefile
+++ src/exceptions/Makefile
@@ -52,13 +52,14 @@
        OFThreadStartFailedException.m		\
        OFThreadStillRunningException.m		\
        OFTruncatedDataException.m		\
        OFUnboundNamespaceException.m		\
        OFUnsupportedProtocolException.m		\
+       OFUnsupportedVersionException.m		\
        OFWriteFailedException.m
 
 INCLUDES = ${SRCS:.m=.h}
 
 include ../../buildsys.mk
 
 CPPFLAGS += -I. -I.. -I../.. -I../runtime
 LD = ${OBJC}

ADDED   src/exceptions/OFUnsupportedVersionException.h
Index: src/exceptions/OFUnsupportedVersionException.h
==================================================================
--- src/exceptions/OFUnsupportedVersionException.h
+++ src/exceptions/OFUnsupportedVersionException.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012
+ *   Jonathan Schleifer <js@webkeks.org>
+ *
+ * All rights reserved.
+ *
+ * This file is part of ObjFW. It may be distributed under the terms of the
+ * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
+ * the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
+ * file.
+ */
+
+#import "OFException.h"
+
+/**
+ * \brief An exception indicating that the specified version of the format or
+ *	  protocol is not supported.
+ */
+@interface OFUnsupportedVersionException: OFException
+{
+	OFString *version;
+}
+
+#ifdef OF_HAVE_PROPERTIES
+@property (readonly, assign) OFString *version;
+#endif
+
+/**
+ * \param class_ The class of the object which caused the exception
+ * \param version The version which is unsupported
+ * \return A new unsupported version exception
+ */
++ exceptionWithClass: (Class)class_
+	     version: (OFString*)version;
+
+/**
+ * Initializes an already allocated unsupported protocol exception
+ *
+ * \param class_ The class of the object which caused the exception
+ * \param version The version which is unsupported
+ * \return An initialized unsupported version exception
+ */
+- initWithClass: (Class)class_
+	version: (OFString*)version;
+
+/**
+ * \return The version which is unsupported
+ */
+- (OFString*)version;
+@end

ADDED   src/exceptions/OFUnsupportedVersionException.m
Index: src/exceptions/OFUnsupportedVersionException.m
==================================================================
--- src/exceptions/OFUnsupportedVersionException.m
+++ src/exceptions/OFUnsupportedVersionException.m
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012
+ *   Jonathan Schleifer <js@webkeks.org>
+ *
+ * All rights reserved.
+ *
+ * This file is part of ObjFW. It may be distributed under the terms of the
+ * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
+ * the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
+ * file.
+ */
+
+#include "config.h"
+
+#import "OFUnsupportedVersionException.h"
+#import "OFString.h"
+
+#import "OFNotImplementedException.h"
+
+@implementation OFUnsupportedVersionException
++ exceptionWithClass: (Class)class_
+	     version: (OFString*)version
+{
+	return [[[self alloc] initWithClass: class_
+				    version: version] autorelease];
+}
+
+- initWithClass: (Class)class_
+{
+	Class c = [self class];
+	[self release];
+	@throw [OFNotImplementedException exceptionWithClass: c
+						    selector: _cmd];
+}
+
+- initWithClass: (Class)class_
+	version: (OFString*)version_
+{
+	self = [super initWithClass: class_];
+
+	@try {
+		version = [version_ copy];
+	} @catch (id e) {
+		[self release];
+		@throw e;
+	}
+
+	return self;
+}
+
+- (void)dealloc
+{
+	[version release];
+
+	[super dealloc];
+}
+
+- (OFString*)description
+{
+	if (description != nil)
+		return description;
+
+	description = [[OFString alloc] initWithFormat:
+	    @"Version %@ of the format or protocol is not supported by class "
+	    @"%@", version, inClass];
+
+	return description;
+}
+
+- (OFString*)version
+{
+	return version;
+}
+@end