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

At 2015-05-02 08:52 -0400, Thomas Passin wrote:
XML markup isn't fundamentally limited to "hasA".
The specific aspect being discussed was XML syntax.

Consider RDF. ... an "existential conjunctive" language, which means that it can declare both isA and hasA notions. RDF graphs can be expressed with an XML syntax. Therefore, (at least some) XML languages are able to express isA.
Absolutely, yes ... I said it myself:

At 2015-05-01 17:24 -0400, G. Ken Holman wrote:
Anyone gets to interpret "isA" any way they wish, but in the syntax ... the start and end tags contain ("hasA") their descendants.
Interpretation of content is in the eye of the beholder. Just because I choose to mark up text with my understanding of a semantic behind why I marked it up, anyone else can choose to interpret the markup any way they wish.

The "hasA" is inherent in the syntax. Elements have attribute. Elements have descendants. Elements and attributes can have very rich labels using namespaces so as to unambiguously label what has what.

But XML stops there ... it is the applications conferring semantics on what has been marked up that adds layers of "isA" or anything else on the marked up content.

All power to anyone who wishes to interpret what has been marked up any way they want ... including the RDF semantics.

So, I believe the "isA" you have described is a property of the RDF, not a property of the XML that expresses the RDF.

At 2015-05-02 08:52 -0400, Thomas Passin wrote:
No, XML expresses *relationships*, which may or may not be hierarchical. You can describe fully non-hierarchical data, such as maps or graphs, with several different methods.
I disagree ... I believe it is the application interpreting the syntax to infer a relationship between content that has been marked up only with "hasA". Even ID/IDREF is but the property of having a pointer ... it is up to the application to interpret what that pointer means.

. . . . . . . Ken

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