Conditional in Email notification

I need to put a special xml code in the email notification and i need to use conditionals to output or not a block of code based on the value of a field. For instance:

if({numberOfRooms:45} > 1) {
<RoomData>
<Category>{Tipologia:10:value}</Category>
<Service>{Servizio:11:value}</Service>
<Adults>{Adulti:12}</Adults>
<Kids>
<Qty>{Bambini:13}</Qty>
<Age>{Età primo bambino:38}</Age>
<Age>{Età secondo bambino:39}</Age>
<Age>{Età terzo bambino:40}</Age>
<Age>{Età quarto bambino:41}</Age>
<Age>{Età quinto bambino:42}</Age>
</Kids>
</RoomData>
}

is that possible? How? Thanks.