JSON first. XML when people ask for it and when you have no more excuse to delay it. It is so much easier to play with JSON, or to pick a particular value. Most

JSON first. XML when people ask for it and when you have no more excuse to delay it. It is so much easier to play with JSON, or to pick a particular value. Most languages (with a library built-in or not), lets you manipulate the result as a combination of dictionary/hashmap and array/list. It is SO easy.