[rules-users] join gateway

Please give me some example to illustrate the difference between 'XOR', 'Discriminator', 'n of m'? And my understanding of 'And' should be waiting for ALL incoming branches are completed before move to the next node, is it correct? So, if I have 2 incoming branches are from 2 human task, and the out-going branch is to an END node, if only one human task is finished, the process will not be ended, until the second one is completed by user. Is it correct? Thanks Salina