Question on using queryForObject(statementName, parameterObject, resultObject);

[Warren]

I have an item object that has a tax object that has a description field 
I need to set. I want to use the item object as the parameter and the 
same object as the result.

sqlMap.queryForObject("getTax", item, item);
<select id="getItemTax" parameterClass="item">
  SELECT TAX_Name AS tax.description FROM ...
</select>

It is the tax.description that is getting me in trouble. How do I write 
this or escape this? Or am I doing this completely wrong?

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Thanks,

Warren Bell