This "boundary" stuff and the two "Content"-lines look like HTTP multipart POST data (RFC2388) to me. On the other hand, HTTP POST data should also have a "Content-Disposition" header with a name attribute after each boundary.

Is this real data or shortened? Where does the data come from?

In a HTTP context, I would expect some library to parse the HTTP data and provide them in a more accessible form. For example, using the classic CGI module, each XML document would be available by its parameter name using the param() or upload() methods.

Alexander