Re: [xml-dev] Query regarding attribute grouping in XML Schema

[sabina suresh <sabi_india@yahoo.com>]

hi,

I need to specify this constraint in W3C XML Schema. I
tried grouping both attributes in an attribute group
and then specifying that the attribute group is
optional. But using the "use" attribute on attribute
group is not permitted like the following:

<xsd:attributeGroup name="address"/>
<xsd:attribute name="doorno" type = "xsd:string"/>
<xsd:attribute name="streetname" type="xsd:string"/>
</xsd:attributeGroup>

While referencing the address attribute group,

<xsd:attributeGroup ref="address" use="optional"/>

I'm not able to  describe this constraint using an
annotation in a way in which it would be validated by
a parser. Could you please give an example for the
same? I would also like to know if it will be treated
as documentation or would it be validated against by
the parser? 

regards,
Sabina

--- James Clark <jjc@jclark.com> wrote:
> 
> > > <element name="ADDRESS">
> > >   <optional>
> > >     <attribute name="doorno"/>
> > >     <attribute name="streetname"/>
> > >   </optional>
> > > </element>
> >
> > I have no experience in RELAX-NG but this look
> like a good and simple way
> of
> > specifying the above constaint. But if this is how
> you specify that an
> > element should either have no attributes or both
> then how would you
> specify
> > that element ADDRESS can optionally have
> attributes doorno and streetname
> but
> > without the connection between the attributes?
> > Would that be something like:
> >
> > <element name="ADDRESS">
> >   <optional>
> >     <attribute name="doorno"/>
> >   </optional>
> >   <optional>
> >     <attribute name="streetname"/>
> >   </optional>
> > </element>
> >
> > or?
> 
> It would be exactly that.
> 
> James
> 
> 
> 
>
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