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On Fri, May 1, 2015 at 2:53 PM, Costello, Roger L. <costello@m...> 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 --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- To avoid situations in which you might make mistakes may be the biggest mistake of all ------------------------------------ Quality means doing it right when no one is looking. ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play ------------------------------------- To achieve the impossible dream, try going to sleep. ------------------------------------- Facts do not cease to exist because they are ignored. ------------------------------------- Typing monkeys will write all Shakespeare's works in 200yrs.Will they write all patents, too? :) ------------------------------------- I finally figured out the only reason to be alive is to enjoy it.
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