Envelopes!

Is there any program that will print envelopes from an xml page?
it looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<OpenContacts><Version_Info MajorVersion="1" MinorVersion="4"/><Locale Lang="en" CreateDate="20081210T173520Z"/><Contacts><Contact Name="Name" IsCompany="0" GivenName="Name" Surname="Name" MidName="" Title=""><Sections><Section Name="Personal"><Fields><Field Name="Street" Value="Street"/><Field Name="City" Value="City"/><Field Name="State" Value="State"/><Field Name="Postcode" Value="ZIP"/></Fields></Section></Sections></Contact></Contacts></OpenContacts>
the italic-bold text will repeat over and over for each address
btw, the return address will be the same