<Envelope xmlns="http://www.usps.gov/" xmlns:foo="http://www.usps.gov/foo">
  <DearSir>foo</DearSir>
  <Body>bar</Body>
  <YoursSincerely>
    
  </YoursSincerely>
  <PostScript>bar</PostScript>
  <Notaries xmlns="" Id="notaries">
    <Notary name="Great, A. T."></Notary>
    <Notary name="Hun, A. T."></Notary>
  </Notaries>
  
</Envelope>