• From: Martin Gudgin <marting@d...>
• To: Iain W Fergusson <fergusson_iain@j...>, duane@x...
• Date: Thu, 17 May 2001 12:46:41 +0100

----- Original Message -----
From: "Iain W Fergusson" <fergusson_iain@j...>
To: <duane@x...>
Cc: <Pcj@I...>; <Tom.D.Conder@L...>; <xml-dev@l...>
Sent: Thursday, May 17, 2001 11:25 AM
Subject: Re: Attributes v Elements


<SNIP>
> >You would be better off to use a more definitive description of what the
> >monetary value is.   "USDollar" is really the value for "Currency".  Try
> >something like this:
> >
> ><Price currency="USD">10</Price>
> >
>
> In the above example <price> has to be described in XML Schema using a
> <complexType>, because of the presence of the currency attribute.
> There is then no way of constraining the contents of <price> to be a
number.
>
> If you need to validate that <price> is a number, it has to be a
<simpleType>,
> which cannot have attributes.
>
>

This is incorrect. There is no problem describing the Price element and
constraining the content to be a number. XML Schema provides facilities for
describing types with attributes and constrained text content. The type
definition would look like this;

<xs:complexType name='PriceType' >
  <xs:simpleContent>
    <xs:extension base='xs:decimal' >
      <xs:attribute name='currency' type='xs:string' />
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>

a global element declaration could then be used to reference the PriceType;

<xs:element name='Price' type='PriceType' /> <!-- playing fast and loose
with namespaces for brevity -->


Regards

Martin Gudgin
DevelopMentor

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  • Re: Attributes v Elements
    • From: Iain W Fergusson <fergusson_iain@j...>

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