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When I first thought of a xml serializer written in Swift, the first thing that came to my mind was to write something that would take a dictionary as an input and return a string with the xml represented in the dictionary. That was, of course, the way I had done it before with Objective-C, where a NSDictionary had no type restriction on the keys apart of implementing the NSCopying protocol, or the values. While this is very easy to implement, it forces us to a lot of runtime type checking, to make sure the objects we want to serialize as xml are actually serializable.

In Swift, we can use the enums with associated values to define the types allowed in our xml serializer so we don’t need any runtime type checking. This is also safer as we know beforehand the types of the objects we have in our xml…

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