How to pass custom xml tag with item

I want to pass extra parameter with item  xml element dose
it
possible?

for example
   <item>               
<merchant-item-id>GGLAA1453</merchant-item-
id>
                <item-name>Dry Food
Pack</item-name>
                <item-description>One pack of
nutritious dried food
for emergencies.</item-description>
                <quantity>1</quantity>
               
<tax-table-selector>food</tax-table-selector>
                <unit-price
currency="USD">4.99</unit-price>
            </item>

can i make like
  <item>               
<merchant-item-id>GGLAA1453</merchant-item-id>
                <item-name>Dry Food
Pack</item-name>
                <item-description>One pack of
nutritious dried food
for emergencies.</item-description>
                <quantity>1</quantity>
                <flight-info>US
Airlines<flight-info><tax-table-
selector>food</tax-table-selector>
                <unit-price
currency="USD">4.99</unit-price>
            </item>


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the
Google Groups "API Integration Basics" group.
To post to this group, send email to
google-checkout-api-integrationgooglegroups.com
To unsubscribe from this group, send email to
google-checkout-api-integration-unsubscribegooglegroups.com
For more options, visit this group at http://groups.google.com/group/google-checko
ut-api-integration?hl=en
-~----------~----~----~----~------~----~------~--~---