Core Protocol Stack <architecture> 1. A portion of the {Web Services} {architecture} for defining and describing various {Web Services}. 2. The architectural {protocol} layers of a {Bluetooth} {wireless} {communication} system, comprising the {Host Control Interface} (HCI), {Logical Link Control and Adaptation Protocol} (L2CAP), {RS232 Serial Cable Emulation Profile} (RFCOMM), {Service Discovery Protocol} (SDP), and {Object Exchange} (OBEX). (2002-06-28)