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Re: typing with XML Schema [T2005020400AD]

• To: hchan@w...
• Subject: Re: typing with XML Schema [T2005020400AD]
• From: listenercare@x...
• Date: Fri, 4 Feb 2005 17:45:33 -0500 (EST)
• Cc: xml-dev@l...

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On February 4 2005 at 11:07:00 EST Ho-Kuo Chan <hchan@w...> wrote:
> Apologies, in my earlier message I said that the following code is invalid:
>
> <xsd:simpleType name="my_element_type">
>      <xsd:restriction base="xsd:unsignedShort"/>
> </xsd:simpleType>
>
> but in fact is valid and does what I want it to after closer inspection.
>
> Chiusano Joseph wrote:
> >>-----Original Message-----
> >>From: Ho-Kuo Chan [mailto:hchan@w...]
> >>Sent: Friday, February 04, 2005 9:33 AM
> >>To: xml-dev@l...
> >>Subject:  typing with XML Schema
> >>
> >>Hi,
> >>I'm not sure if this is the correct forum for my question,
> >>forgive me if it is not and feel free to point me in the
> >>correct direction for it.
> >>What I would like to do is create a new simpleType that is
> >>identical to a built-in type, without any restrictions.
> >>Consider an example from C
> >>language:
> >>
> >>typedef uint16_t my_element_type;
> >>
> >>What's the point? Well doing this allows me to use the
> >>"my_element_type"
> >>everywhere and if it's size ever changes from say the 16 bits
> >>defined to say 32 bits, I can just replace the line above with:
> >>
> >>typedef uint32_t my_element_type
> >>
> >>and the update becomes automatic throughout.
> >>
> >>I thought something like this would have been perfect but is iilegal:
> >>
> >><xsd:simpleType name="my_element_type" base="xsd:unsignedShort"/>
> >>
> >>then I tried this:
> >>
> >><xsd:simpleType name="my_element_type">
> >>    <xsd:restriction base="xsd:unsignedShort"/> </xsd:simpleType>
> >>
> >>but it too is illegal.
> >
> >
> > I recommend that you reference the W3C Schema Primer[1] for an example
> > of this - see section "2.1 The Purchase Order Schema", specifically
> > "<xsd:element name="quantity">".
> >
> > Hope that helps.
> >
> > Kind Regards,
> > Joseph Chiusano
> > Booz Allen Hamilton
> > Strategy and Technology Consultants to the World
> >
> > [1] http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/
> >
> >
> >>Is there an elegant way to do this? Thanks in advance!
> >>--
> >>HK Chan
> >>
> >>-----------------------------------------------------------------
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> >><http://www.oasis-open.org>
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> >
> >
>
> --
> Ho-Kuo Chan
> Software Designer
> Wavesat Inc.
> Tel: 514-684-0200 X322
>
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