Thank you for you answer. I believe that the tag can be querry only with the 6.5 release of SDK (i was based on https://communities.vmware.com/thread/548240?start=0&tstart=0) but i am a novice so i'm not sure at all.
So if understand you i can't acces new features of the 6.5 on a VCenter 6.0 . But tags are not a new feature of VCenter so if I want to querry them i just need my SDK on 6.5 version ?
Thx a lot