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- From: Eric van der Vlist <vdv@dyomedea.com>
- To: "Roger L. Costello" <costello@mitre.org>
- Date: Sun, 03 Sep 2000 19:10:48 +0200
Roger,
Yes, I think your derivation is legal and you have a similar example in
the XML Schema Primer
(http://www.w3.org/TR/xmlschema-0/#complexTfromSimpleT).
I have found that the most reliable schema validator is XSV, which is
available as a web service:
http://www.w3.org/2000/06/webdata/xsv
Why wouldn't give it a try ?
Hope this helps,
Eric
"Roger L. Costello" wrote:
>
> Hi Folks,
>
> I have a question about deriving by extension from a user defined
> simpleType.
>
> Suppose that I would like to create a schema for this:
>
> <cost currency="USD">41.95</cost>
>
> Here is one approach:
>
> <element name="cost">
> <complexType base="decimal" derivedBy="extension">
> <attribute name="currency" type="string" use="required"/>
> </complexType>
> </element>
>
> The disadvantage of this approach is that it allows <cost> to contain
> any decimal value. Suppose that we want to restrict it to contain a
> decimal value with no more than two digits to the right of the decimal
> point. Here is a simpleType to define a restricted decimal:
>
> <simpleType name="money" base="decimal">
> <scale value="2"/>
> </simpleType>
>
> Now, let me modify the above cost declaration to reference this new
> type:
>
> <element name="cost">
> <complexType base="t:money" derivedBy="extension">
> <attribute name="currency" type="string" use="required"/>
> </complexType>
> </element>
>
> (Let's assume that "t" has been set to the targetNamespace)
>
> Is this second version of cost legal? Can we derive (by extension) from
> a user defined simpleType?
>
> I have found that the Apache 1.2 parser does not accept the second
> version, whereas it does accept the first version. /Roger
--
------------------------------------------------------------------------
Eric van der Vlist Dyomedea http://dyomedea.com
http://xmlfr.org http://4xt.org http://ducotede.com
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