Can someone explain what does the "xor check" check? I have run the mpw pre check locally for my design as well as the example por project for caravan. In both cases xor check reports similar number of violations. What is the cause and mitigation?

Hi, @User take a look at that https://www.klayout.de/doc/manual/xor.html

Thanks. I will look at it

the question is what exactly is being compared, I suppose is the final layout compared with ... yes that is the question. I have similar problems with the next step I mean LVS so I someone could hel us with that very late stages it would be great.

Thanks for the help. Actually I am running this for caravan and all other checks are passed except this.

Apparently your drawings are crossing boundaries. Look around the positions reported by xor check.