BigSam,

Samples are provided (at the bottom) of the article.

Here is your specific one.

print 'Filter on specific Countries and OrderDate'

EXEC uspOrderDetailsGetByXmlParams '

<ParametersDS>

 <CustomerCountry>

  <CountryName>USA</CountryName>

 </CustomerCountry>

 <SingleValueParam>

  <OrderDateAfter>1/1/2006</OrderDateAfter>

 </SingleValueParam>

</ParametersDS>

'