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On Fri, Sep 28, 2018 at 11:06 AM Ihe Onwuka <ihe.onwuka@gmail.com> wrote:Whereas by implication of what you have said you want to claim that 

is explicitly labeled.

So to flesh out your claim. Somehow the presence of the attribute on the Cost element interferes with what you are calling explicit labelling. 

Except that it doesn't.

I think Roger's point is that a cost, like a length or a mass, is meaningless without a unit.  "What does that cost?"  "Five."  "Five what?  Dollars, cents, dinars, zlotys, razbuckniks?"  So he is arguing that the two components of a cost, the numeric part and the unit, each should be explicitly marked up.  I think he is clearly right about the first point, and arguably right about the other, at least for XML-as-data.

When SGML/XML were all about textual documents, the role of attributes was fairly clear: marginal notes or commentaries on the text.  In that context, you want to preserve the text as is, and <quote><currency value="5" unit="USD>Five.</currency></quote> makes a lot of sense.  Note that this meets Roger's criterion for explicit markup.

John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
Almost all theorems are true, but almost all proofs have bugs.
        --Paul Pedersen

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