Transaction handling: inserting xml and non-xml data at once

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Hi,

I have to use http API for Java (TaminoClient) version 3.1.2.1.
I need to insert two documents in one transaction: an xml document and a non-xml (pdf) document. These two are on the same database, but different collections. Is it that possible? If yes, how?

Here is a pseudo-code what I intend to do:

try {
  TaminoClient tcXML = new TaminoClient (DATABASE_URL + "/" + XML_COLLECTION);
  tcXML.startSession();
  TaminoNonXml tcNonXML = new TaminoNonXml (DATABASE_URL + "/" + PDF_COLLECTION);
  tcNonXML.setSessionID(txNML.getSessionID()); ....//??! how to make tcNonXML use the same session as tcXML?

  Element element = getNextElement(); //get the next "parent" to insert
  tcXML.insert(element);
  byte[] pdf = getPDF(element);
  tcNonXML.setNonXML("pdf/"+FILENAME, "application/pdf", new ByteArrayInputStream(pdf) );//insert the associated pdf
  tcXML.commit();
  tcXML.endSession();
} catch(Exception e) {
  tcXML.rollBack();
  tcXML.endSession();
}

protected abstract String getNextElement(); //returns the next parent to insert

protected abstract byte[] getPDF(Element element);//returns pdf to insert