I hope this helps: https://tech.forums.softwareag.com/t/attaching-a-pdf-document-into-an-xml-message/134281

Yes, the binary document is encoded in base64 and treated like other data.  XML is a character oriented standard, so binary cannot be embedded in an XML document without encoding into a character based encoding scheme, of which base64 is by far the most popular.

However, many specifications, including those promulgated by OASIS, have an attachment mechanism which places a reference to the binary document in the XML, and then places the binary file data in the same stream, using identifiers.  I encountered this situation when adapting a Court Management System into a government-required LegalXML court document filing system.

Are you trying to follow the specification for a specific system?

Hello,

I got this working.

First I create the XML using C$XML.

I found a command line utiliy called Base64 to create the base64 string from the PDF file.

After that I recreate the XML file and incorporate the base64 string (and the necessaryXML tags) into the XML.