Ricardo,
yes CDATA solution worked fine but how you mentioned with sequence ]] is not appropriated. Also 64binary worked. I think if the provider of webservice will not do effort to make a correct webservice that Powerbuilder can do structures etc.. then 64binary is the best solution. After that the client must do the parsing process.
So well done and thanks for the effort and explinations for this complexe request.
Regards,
Marko