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Michael,
On Jun 14, 2006, at 12:53 PM, Michael Kay wrote:
>> I am having trouble spotting documentation for the XSD
>> question below, can anyone point me to the right part of the
>> specs or example schemas?
>
> It's scattered all over the specs, rather than being in once place.
>
That was my impression...
> You need one schema document per namespace. Any schema document that
> references components (for example elements, types, or attributes)
> defined
> in a different namespace must do an xs:import for that namespace,
> and the
> references must be written as QNames. For example you can do
>
> <xs:element name="invoice">
> <xs:complexType>
> <xs:sequence>
> <xs:element ref="a:address"/>
>
> to reference element "address" defined in another namespace. The
> schema
> containing the declaration of invoice will then (a) contain a
> namespace
> declaration xmlns:a="the-a-namespace-uri", and (b) contain an
> xs:import for
> targetNamespace="the-a-namespace-uri".
Great, thanks. I felt that that was the way to handle it, but I just
did not see the specs making that explicit enough.
Thanks!
Jan
>
> Michael Kay
> http://www.saxonica.com/
>
>>
>> The issue:
>> Suppose I have two XML namespaces, one defining core concepts
>> such as 'Address' and the other one defining things more at a
>> business level, for example 'PurchaseOrder'. Both are just
>> namespaces, defining the concepts not schemas defining any
>> content models.
>>
>> Using concepts from those two namespaces, I now want to
>> assemble an XML schema to express content models for the
>> concepts in the namespaces (and I also want to mix in xlink
>> attributes).
>>
>> For example, I might want to say that a bo:Person must have a
>> core:Address child and that it must have a bo:Parent child
>> that must have an xlink:href attribute.
>>
>> I there a way to do this (especially using element names from
>> different namespaces)?
>>
>>
>> (AFAIK the xlink attributes would be done with allowing any
>> attribute from xlink, is that correct? Can one be more
>> constraining here?)
>>
>>
>> Many thanks in advance!
>>
>> Jan
>>
>>
>>
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>
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