Say every router is a member whose attribute 0x8f04 (this is a hexadecimal number) equals zero AND attribute 0x0601 is less than or equal to 10 AND attribute 0x1101 is equal to 1. (Note: Term ???attribute??? here refers to a NetJazz protocol (NJP) attribute as the used hexadecimal constants are from NJP. Embodiments of the invention would work with any implementation where the attributes in questi