XML Select

I need to do (one of my first) select as XML statements

I need <?xml version="1.0" encoding="UTF-8" ?> at the top
Then the "root tag" is <Document>
Then a <Header> section with hard coded nodes
Then a <Record> section with firstname, lastname etc nodes

Example would be (selecting first and last name from r_users).
<?xml version="1.0" encoding="UTF-8" ?>
<Document>
  <XMLVersion Version="2.00"/>
  <Header>
       <PacketNum>0000000111222555</PacketNum>
        blah...blah..blah...
  </Header>
  <Record>
     <SeqNum>1</SeqNum>
     <firstName>Bill</firstName>
     <lastName>Gates</lastName>
         blah..blah..blah...
  </Record>
</Document>