Re: [xml-dev] RE: List of differences between XML and JSON?

[Dimitre Novatchev <dnovatchev@gmail.com>]

On Fri, May 1, 2015 at 2:53 PM, Costello, Roger L. <costello@mitre.org> wrote:
>
> That JSON appears to me to express containment/hierarchy/parent-child. Surely it is expressing this:
>
>         Book has a title "Parsing Techniques", with Authors Dick Grune
>         and Ceriel J.H. Jacobs, date (of publication) 2007, and publisher
>         Springer.
>
> Isn't the JSON expressing a "hasA" view?

Any JSON object can be part of (shared by) many other JSON objects.
This isn't so with a node of an XML document. In a tree, by definition
any node can have at most one parent.

So, in an XML document there is real ownership, while within a JSON
document this is just "sharing".

The ability of any JSON object to be shared amongst any number of
other JSON objects is what makes it possible to have very efficient
modification of a JSON object (compared with complete
copying+modifying of an XML document, to create an entirely new,
non-overlapping XML document). In the former case, only the paths
leading to the modifications need to be copied in the new object, all
other sub-objects can be shared between the old and the new JSON
objects.





-- 
Cheers,
Dimitre Novatchev
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