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Re: [xml-dev] Which is more declarative? More XMLish?

On 12/2/2017 9:26 AM, Costello, Roger L. wrote:
Hi Folks,

XML documents oftentimes contain a set of things – a set of books, a set
of people, a set of transactions, etc.
The only XML documents I've seen contain elements, attributes, textual data, PIs, and DTDs. They never contain books or people, or sets of them.

I don't mean to be all academic here, but I think it would be well to start out talking about what can really be in a document. The understanding or interpretation of that document is beyond the scope of XML per se.

So a translation of what you seem to want to talk about is "elements in an XML document can be considered to represent or map to sets. Is there a good XML-ish way to represent or define how to represent and constrain a set in an XML document?"

Sounds like a job for OWL...

[clip ...]

Recap: We’ve seen two ways to specify (constrain) a set:

(a) State a property (or properties) that an object must have to qualify
as a member of the set.

(b) Define a set of rules which generate its members.
There is a third alternative:

(c) Enumerate the members of the set.


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