Do I need transfer Visa in Xian Xianyang Airport?

Hello,

I am traveling from Prague to Sydney and I am EU citizen, whereas the flight segments are: (i) PRG to PVG with technical stop (1h35m) at XIY, then layover at PVG for 6 hours and the connecting flight PVG to SYD. I was wondering whether I need any kind of transfer visa, since technically I will be touching twice on China's mainland on my way to Sydney (i.e. in XIY and PVG). Thanks for your help in advance.