Re: How do I determine that an item is a numeric atomi

On Sun, Oct 3, 2010 at 3:40 AM, David Carlisle <davidc@xxxxxxxxx> wrote:
> bah humbug, couldn't schema 1.x have added a numeric type sitting above all
> those in the hierarchy:-)

looks a good idea :) Here are few questions and concerns:

1. XML Schema 1.0 also had same relationship between xs:double and
xs:float (but both were subtypes of xs:anySimpleType, and xs:float was
not child of xs:double -- which I think you are suggesting, in Schema
1.0). In XML Schema 1.1, xs:double and xs:float are subtypes of
xs:anyAtomicType (this is something new in Schema 1.1) whose parent
type is xs:anySimpleType. But xs:anyAtomicType is too wide a type and
includes types like xs:date and so on.

2. Can xs:float really be designed a subtype of xs:double. I think
this can't be true (?) in XML Schema language, since value space (as
defined in XML schema language) of xs:float is not really a true
subset of xs:double (but I think in java float is considered a base
type of double, which I don't really mind :)

Btw we do can I think, design an XML Schema user-defined xs:simpleType
inheriting from (and constraining it with Schema facets) combinations
of xs:double, xs:float, xs:decimal etc, and this should be usable with
a XSLT 2.x/3.0 type system.



-- 
Regards,
Mukul Gandhi