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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: List of differences between XML and JSON?
 On Sun, May 3, 2015 at 5:42 AM, Thomas Passin <list1@tompassin.net> wrote: > > Well, actually, there is nothing to indicate that these two objects are the same. > A _javascript_ engine would create two objects, and if you were to change > the properties of one, the other's properties would not automatically change. Agreed. The example, and the way I am using this is strongly based on assumption that the objects are immutable. We also need to remember, that JSON is widely used not only for representing _javascript_ objects, but also in other important cases -- for example to express the input data for REST web services (seen in practice with the most widely used HTTP verbs) and for their response. JSON is just a specific serialization mechanism -- how JSON would be de-serialized depends solely on the receiving end -- it may be serialized to something completely different than a _javascript_ object. Any good particular implementation would use objects immutability for sharing and efficiency. For the XPath 3.1 map datatype, this is what makes possible to have efficient (sub-linear) implementations of map:put() and map:remove(). Even in a language such as C# there are some immutable objects, such as the string object. This led to a powerful string sharing feature: interned strings: https://msdn.microsoft.com/en-us/library/system.string.intern(v=vs.110).aspx -- Cheers, Dimitre Novatchev 
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