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My intention here is not to teach XML. Basically, the first line of this file specifies that it is, indeed, an XML document. Within the document are different levels of tag. In order for it to be well-formed, it must have a single, all-encompassing, top element, which I just happened to call, “AJ”. Call it anything if you are writing an XML document. All it has to do is encompass all other elements within it.