Okay, that's perfect.
I found this information on the website. It's the resolution that provides the definition of political prisoner. I'll read paragraph 3:
The Assembly reaffirms its support for these criteria, summed up as follows: “A person deprived of his or her personal liberty is to be regarded as a 'political prisoner': a. if the detention has been imposed in violation of one of the fundamental guarantees set out in the European Convention on Human Rights and its Protocols (ECHR), in particular freedom of thought, conscience and religion, freedom of expression and information, freedom of assembly and association; b. if the detention has been imposed…
I won't take up any more time, but you can find this text on the website.
In my opinion, it would be very important to define what a prisoner of conscience is and what a political prisoner is.
Since Canada already has observer status with the Parliamentary Assembly of the Council of Europe, I think you can work from this definition. I know that human rights organizations in Russia, such as Memorial, have been working for many years now based on this definition of a political prisoner adopted by the Council of Europe.