Re: [Vtd-xml-users] xerces discussion on VTD

[Tatu S. <cow...@ya...>]

--- Boris Kolpackov <bo...@co...> wrote:

> Hi Jimmy,
> 
> Jimmy Zhang <cra...@co...> writes:
> 
> > do you see this as an essential feature of XSD?
> 
> Looking at the wide use of default attribute values
> in public
> schemas we can conclude that the users have decided
> it is an
> essential feature ;-). I personally also think that

Actually, I'm not sure that is conclusive proof --
what
matters more is how many actual document instances
make
use of such features.

However, it is interesting finding that so many
schemas
do make use of this feature. Personally I find it
depressing... since:

> it is a
> handy feature (just as default argument values in
> modern
> programming languages).

It may be just me, having to write parsers, but I
think
inclusion of attribute defaulting in XML Schema was
one
of its biggest blunders. It has nothing to do with
either
validation or data typing -- such business-logic
definitions
belong to another layer, not to static-by-nature
structural
(and coarse data typing) constraints model as schemas.

And as to programming languages, some have it (c++,
languages
with named parameters), others not (java, and most
scripting
langauges). I prefer not to have them, as kind of
syntactic
sugar I can live without; but at least it's less
fragile
as defaulting actual data in documents.

I can of course see practical convenience value, but I
would
lump it together with similar features like xml
general entities
or C preprocessor macros.

Anynway, to each his own,

-+ Tatu +-



 
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