Is multipart/related mime supported?

[JML]

Hi, 

I'm using ksoap2 in my android application to communicate with WS since a few weeks and for all methods works fine but now I am in a deep doubt, ksoap2 support mime multipart/related? I have been searching in Internet, in ksoap2 api, stackoverflow but I didn't find anything... I have a request like that:

<mime:multipartRelated>

<mime:part>

<soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" parts="parameters" use="literal"/>

</mime:part>

<mime:part>

<mime:content part="file" type="*/*"/>

</mime:part>

</mime:multipartRelated>

I have to send a request similar to this:

Content-Type: Multipart/Related; boundary=MIME_boundary; type=text/xml;
        start="<xx.xml@XXX.xx>"
Content-Length: XXXX
SOAPAction: ""
Content-Description: This is the optional message description.

--MIME_boundary
Content-Type: text/xml; charset=UTF-8
Content-Transfer-Encoding: 8bit
Content-ID: <xxx...@XXX.xx>

<?xml version='1.0' ?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Body>
...

</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

--MIME_boundary
Content-Type: image/tiff
Content-Transfer-Encoding: base64
Content-ID: <file=xxx....@XXX.xx>

...Base64 encoded TIFF image...
--MIME_boundary
Content-Type: image/jpeg
Content-Transfer-Encoding: binary
Content-ID: <xxx....@XXX.xxm>

...Raw JPEG image..
--MIME_boundary--

All I have found it is to include the file inside of XML envelope but no out in a separate part, anybody know if it is posible? How can I do it? Or for this kind of messages I can not use koap2?

Many thanks, JML.