i.e. If there is a Type1 product, then don't output Type2 or Type3.
However, if there is no Type1, then output Type2, but not Type3 if it's
present.
<xsl:copy-of
select="ProductGroup[Product/@Type='Type1']/Product[(_at_)Type='Type1'] |
ProductGroup[not(Product/@Type='Type1')][Product/@Type='Type2']/Product[(_at_)Type='Type2']
|
ProductGroup[not(Product/@Type='Type1')][not(Product/@Type='Type2')]/Product[(_at_)Type='Type3']
"/>
David
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