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RE: List of differences between XML and JSON?

Thank you for the fantastic feedback!

I updated the list using your feedback. Is there anything else that should be added?  /Roger


JSON is often compared to XML. However, there are significant differences:

-          XML supports comments, JSON does not.

-          XML supports processing instructions, JSON does not.

-          XML provides multiple syntaxes to express things (e.g., attribute values can be delimited by either a single or double quote, attributes can be in any order), JSON does not have such flexibility.

-          XML child nodes (text, elements, comments, PIs) have order, the key/value pairs in JSON objects are unordered.

-          XML uses canonicalization to convert XML into a standard form. Since ordering doesn't exist in JSON objects, a canonical form for JSON is problematic: with no canonical order, there's no standard byte stream.

-          XML has namespaces, JSON does not.

-          XML supports mixed content, JSON does not.

-          XML has entities and notations, JSON does not.

-          XML does not have arrays (although they can be simulated), JSON has arrays. JSON objects inside arrays have position, but no name; if an array is inside an object, then the name could be mapped from the key name for the array member; JSON arrays inside arrays inside an object are somewhat more of a challenge.

-          XML uses different character sets (NCName) for markup than for content, JSON uses the same character set throughout the entire document.

-          XML supports any character encoding scheme, JSON supports exclusively Unicode.

-          XML has pointy brackets, JSON has curly and square ones.

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