Question about ODRL 2.0 Common Vocabulary

Good morning,
I wrote you this email for clarify, if I am allowed, a few doubt about ODRL 2.0 Common Vocabulary and the possibility to extend this vocabulary with dedicated profiles. In your ODRL 2.0 Common Vocabulary final specification (https://www.w3.org/community/odrl/two/vocab/#section-3) I read that the possibility to extend the Common Vocabulary is concrete but I didn't find any technical implementation for this kind of extension (differently, I found all the informations what I need about the extension of Core Model in the Core Model concrete XML Schema). I forget to tell you that I am an Information Technology student in University of Milan: my purpose is to conduct a research about ODRL 1.1 and ODRL 2.0 for my graduation thesis, with some practical example about real and study cases. I need to extend the ODRL 2.0 Common Vocabulary with some specific permissions and constraints (and other stuff, of course) what are more adapted to define licences over my study cases. 
So, my question is: where can I find a concrete example about Common Vocabulary extension? Something like an .xsd file for ODRL 1.1 where I can use something like the ODRL 1.1 SubstitutionGroup to define new permissions or constraints. Always if this is possible, because I found several technical reports and specification documents about ideas or projects for future Community Profiles, but I didn't find any examples or implementations of this kind of projects.
Thanks a lot for your attention, and I ask you to forgive me for my bad english.
I am waiting for an answer. 
My best regards.

Farinelli Agnese