Wow, ok, kind of nasty about it but ok.
I apologize if you consider a suggestion or declaration of openvz as not real. Perhaps 'real' is an inaccurate word to use to describe the difference between what openvz provides (or doesn't provide) to other types of virtualization implementations.
Wikipedia has a decent perhaps non-nasty explanation. Besides... the ability for any other human existence to prepare an alternative resource for similar or additional types of documentations is easily attainable, and if any such individual desires to pursue such efforts, they can easily make use of what I have publicly referenced here, including the gnumeric spreadsheet.
However, also to be fair is the reality of which pricing structures for openvz vary quite differently to kvm/xen vps providers in the sense that prices for openvz vps are oftentimes very much lower than xen/vm vps environments, and therefore, mixing them together without uniquely identifying them may cause confusion. And since I didn't add reference to distinctly indicate which virtualization platforms were used, I decided not to include openvz because of the potential for the vast difference in pricing causing some confusion.