summary,owner,anyotherfield,priority,component,description,comment
sum1,me again modified,anything,mypriority,again again mycomp again,description1 modified,comment with some modified fields
sum2,you,somethingelse,yourpriority,yourcomp,description2,comment with no field modified
newticket,you,,yourpriority,yourcomp,new description,comment for a new ticket