Use one file per class.

src/XMPPIQ.m

@@ -0,0 +1,24 @@
+#import "XMPPIQ.h"
+
+@implementation XMPPIQ
++ IQWithType: (OFString*)type_
+	  ID: (OFString*)ID_
+{
+	return [[[self alloc] initWithType: type_
+					ID: ID_] autorelease];
+}
+
+- initWithType: (OFString*)type_
+	    ID: (OFString*)ID_
+{
+	if (!([type_ isEqual: @"get"] ||
+	      [type_ isEqual: @"set"] ||
+	      [type_ isEqual: @"result"] ||
+	      [type_ isEqual: @"error"]))
+		of_log(@"Invalid IQ type!");
+
+	return [super initWithName: @"iq"
+			     type: type_
+			       ID: ID_];
+}
+@end