Schema attibute/complexType problem

[steve_marjoribanks]

I have a section of a schema below and I've got a problem I can'y
figure out. I'm not having a good day though so it's probably just me
being stupid!! ;-)
I need the shearStrength element to have an xink:href attribute as
shown below but I also need it to have something like:

<extension base="float">
<attributeGroup ref="ags:UoMGroup" />
</extension>

ie. i need to restrict the value of shearStrength to a float value and
associate it with an attributeGroup I already have, as well as
including the xlink:href attribute.
<element name="layerMaterialParameters">
<complexType>
<sequence>
<element name="shearStrength">
<complexType>
<attribute ref="xlink:href" use="required"/>
</complexType>
</element>
<!-- other elements here -->
</sequence>
</complexType>
</element>

Any help would be much appreciated!

Steve

[monique]

Could it be this ?

<xs:element name="shearStrength">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:float">
<xs:attribute ref="xlink:href" use="required"/>
<xs:attributeGroup ref="ags:UoMGroup"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>

I'm still learnig about namespaces so I tested it without namespaces.
it's not enough, I now :-)

Cheers

Monique

[steve_marjoribanks]

Yeah, after messing around in XMLSpy, I came up with that solution too.
:-)

But somehow it doesn't seem that logical though (assuming it's right!)
having both the attribut and the attribute group which are unrelated
within the same 'float' extension?!
Ah well!

Steve