<Tr> <Td_colspan="2"> Stamping the travel document </Td> <Td> No </Td> <Td> Yes (with specific groups) </Td> <Td> Yes (with specific groups) </Td> </Tr> <Tr> <Td_colspan="2"> Checking that the traveller has the appropriate visa / residence permit (if required) </Td> <Td> No </Td> <Td> Yes </Td> <Td> Optional </Td> </Tr> <Tr> <Td_colspan="2"> Checking the authenticity of the short - stay visa (if required) and the identity of its holder by consulting the Visa Information System </Td> <Td> No </Td> <Td> Yes </Td> <Td> Optional </Td> </Tr> <Tr> <Td_colspan="2"> Examining entry and exit stamps in the travel document to ensure that the traveller has not exceeded the maximum duration of authorised stay </Td> <Td> No </Td> <Td> Yes (with some exceptions) </Td> <Td> Optional </Td> </Tr>

Which european countries are not in the schengen zone