Why XML data typing is hard
Ketil Z Malde
ketil at ii.uib.no
Tue Dec 1 13:22:59 GMT 1998
<david at megginson.com> writes:
> Liam R. E. Quin writes:
> > david at megginson.com wrote:
> > > Warning: sample.xml line 18 column 12: Cannot validate constraint
> > > "float" for unsupported language "ar" (trying default
> > > locale en-CA).
Hum, so what really was thousand (<value>1,000</value>), gets parsed
as one, since my default is a European locale.
> > Maybe what you really need is
> > <balance xml:type="float" xml:lang='ar'> ...
> > instead?
> That's almost exactly the markup that I was imagining would generate
> the warning, except that I'd use a different namespace for the lexical
> constraint attribute (no need to overload the magic "xml" namespace).
Perhaps somebody could explain to me the rationale of including the
xml:type attribute with the element, instead of in the element
*declaration* (in the DTD). To me, this sounds as if another type would
make as much sense, say a date or integer, or what have you.
In my imagination, that would typcially get messy and cause the run
time errors we want to avoid, so I assume either there's an additional
restriction in the DTD, or there's some fundamental reason I overlook.
If I haven't seen further, it is by standing in the footprints of giants
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