2 levels of MIME attachments in SOAP message

Question

Hello,
I'm not a java specialist, and i want to know a few things before i start something wich eventually turns out impossible to do.
i want to create a SOAP message with one attachment. this attachment must be a multipart/mixed MIME message itself:
-- Part1
soapxml
-- Part1 (1 SOAP attachment = MIME message)
Content-Type: multipart/mixed; boundary:"Part2"
-- Part2
subAttachA
-- Part2
subAttachB
-- Part2
subAttachC
--Part2
--Part1
* first of all: should i use a MimeBodyPart objects for subAttachX and create it with MimeMultiPart.createMimeBodyPart() ?
- that MimeMultiPart i create like this: new MimeMultiPart("mixed") ?
- THIS IS THE MOST IMPORTANT: how do i get this MimeMultiPart into the SOAP attachment part ?
could this work:
//MimeMultipart extends MultiPart + constr: new MimePartDataSource(MultiPart part)
MimePartDataSource mds = new MimePartDataSource(MimeMultiPart multipart);
//MimePartDataSource extends DataSource + constr: DataHandler(DataSource ds)
DataHandler dh = new DataHandler(mds);
//will the following line automatically set: Content-Type: multipart/mixed; boundary:"Part2"
//if not, how can i obtain the boundary (="Part2")
AttachmetPart ap = soapMessage.CreateAttachmetPart(dh);
//will i still be able to set the Content-Id
ap.setContentId("miID");
All help greatly appreciated,
Pieter

Answer 1

Did you already tried the way i described ?
because i can't start untill another question is answered, maybe you know the answer:
http://forum.java.sun.com/thread.jsp?forum=34&thread=351252