I followed the Prince XML documentation when I added XInclude to one of my input documents, http://www.princexml.com/doc/7.0/xinclude/

- but I couldn't figure out why the XInclude in this document wouldn't work with any other tools, e.g. SAXON

Finally I realized that the XInclude namespace in the documentation is "http://www.w3.org/2003/XInclude" while the namespace from the XInclude standard is "http://www.w3.org/2001/XInclude", http://www.w3.org/TR/xinclude/#syntax

Is it intentional that the XInclude namespace in the documentation differs from the namespace from the XInclude standard?

Thanks for the tip, that looks like a mistake on our part!