What does this parameter-name="dummy" means ??

[Ashish Vijaywargiya]

Hi,

<field name="amountApplied" parameter-name="dummy"><display  type="currency" 
currency="${currencyUomId}"/></field>

What does this parameter-name="dummy" means ??
I have seen its xsd file but didn't get its importance.

Can anybody of you explain me the usage of this attribute in detail ??
What happened if we didn't use this attribute ??

Regards
Ashish Vijaywargiya 

                
---------------------------------
How low will we go? Check out Yahoo! Messenger’s low  PC-to-Phone call rates.