Mapping a MIME Message to XML

hi, 

i want to map a multipart mime message to an xml. the mime message looks 
like this:

Message-ID: <...>
Mime-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_Part_0_7859095.988367938056"

------=_Part_0_7859095.988367938056
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit
Content-Description: InfoPart

Q1JFQVRFRHxudWxsfEZyIEFwciAyNyAxMjozODo1MCBDRVNUIDIwMDEjaiNEb2t1
bWVudCBlcnpldWd0I0Rva3VtZW50IGVyemV1Z3Q=
------=_Part_0_7859095.988367938056
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit
Content-Description: HeaderPart

RElELWotOTg4MzY3OTMwMDM5LTY0NTc3MjM4Mjk0NzMyMTY0OTh8RFQ6U0lDT0VN
QUlMLTEuMHxqfHFxcXF8OTg4MzY3OTMwMDMx
------=_Part_0_7859095.988367938056
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit
Content-Description: DataPart
[...]

so what i want to accomplish is maping this mime to a xml that would look 
like this:

<root>
<InfoPart>Q1JFQVRFRHxudWxsfEZyIEFwciAyNyAxMjozODo1MCBDRVNUIDIwMDEjaiNEb2t1bWVudCBlcnpldWd0I0Rva3VtZW50IGVyemV1Z3Q=
</InfoPart>
<HeaderPart>RElELWotOTg4MzY3OTMwMDM5LTY0NTc3MjM4Mjk0NzMyMTY0OTh8RFQ6U0lDT0VNQUlMLTEuMHxqfHFxcXF8OTg4MzY3OTMwMDMx
</HeaderPart>
<DataPart>PD94bWwgdmVyc2lvbj0iMS4wIj8+Cgo8IURPQ1RZUEUgU2ljb0VtYWlsIFNZU1RFTSAnaHR0cDovL3d3dy5qdXN0c2ltcGxlLm5ldC9kdGQvZG9jdW1lbnRzL3NpY29lbWFpbC5kdGQnPgoKPFNpY29FbWFpbD4KCiAgPGhlYWRlcj4KCiAgICA8c3ViamVjdD50ZXN0PC9zdWJqZWN0PgoKICA8L2hlYWRlcj4KCiAgPGJvZHkgLz4KCjwvU2ljb0VtYWlsPgoK
</DataPart>
  ...
</root>

what i did so far is create a receive and a send ****t and add a 
receivepipeline with the mime decoder. propably i have to create a flat
file 
schema for the mime message and a xml schema for the xml output, then a
map. 
i'm not quite sure about the flatfile schema. any ideas, suggestions?

 regards

m.janke