code: protected XmlWriter convertToXml(EmailAddressGrantee grantee, XmlWriter xml) {
          xml.start("Grantee", new String[] {"xmlns:xsi" , "xsi:type"},
                  new String[] {"http://www.w3.org/2001/XMLSchema-instance", "AmazonCustomerByEmail"});
          xml.start("EmailAddress").value(grantee.getIdentifier()).end();
          xml.end();
  
          return xml;
      }
docs: Returns an XML fragment representing the specified email address grantee.
  
  @param grantee
  The email address grantee to convert to an XML representation
  that can be sent to Amazon S3 as part of request.
  @param xml
  The XmlWriter to which to concatenate this node to.
  
  @return The given XmlWriter containing the specified email address grantee