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Since XML can have attributes and children, it’s not as easy to convert to JSON.
Your JSON example is more akin to:
<address street_address="21 2nd Street" city="New York" ...></address>Hmm, so in tree terms, each node has two distinct types of children, only one of which can have their own children. That sounds more ambiguity-introducing than helpful to me, but that’s just a matter of taste. Can you do lists in XML as well?
No arrays are not allowed. Attributes can only be strings. But the children are kind of an array.