Thanks again, but reimplement an already existent functionality will cost too much time for me :(. This project is part of my Master's degree and I just have a couple months to finish all this stuff and write my thesis. Is there any older version of Saxon which fits my needs without this time/money cost?

Thank you very much,
Gustavo Honorato

Yes, you're welcome to stick with Saxon-B 9.1 if it meets your needs. I'll stop fixing bugs in it at some stage but it will still be around.
Michael Kay