eap.conf - eap-tls CA_file =

Hi All, In eap.conf under the tls section the comments for 'CA_file =' says it's a list. Can someone tell me what the separator is? I'm assuming it's a space, I have looked around but have not found any reference. Also, are the 'private_key_file' and 'certificate_file' parameters list too? Thanks, Kevin Sochacki