Conditional MinOccurs in an XSD   

With the following XML

<ProductTypeID>1</ProductTypeID>
<A/>
<B/>
<C/>
<D/>

I'd like to achieve the following scenario in my xsd:

if ProductTypeID = 1 then the XML should be

<ProductTypeID>1</ProductTypeID>
<A/>
<B/>

if ProductTypeID = 2 then the XML should be

<ProductTypeID>2</ProductTypeID>
<C/>
<D/>

Is this possilbe to be enforced in an XSD?

date: Fri, 23 May 2008 12:41:01 -0700 (PDT)   author:   unknown