Service Reference Schema for WS-BPEL 2.0 OASIS Standard 11th April, 2007 This element can be used within a from-spec. This type definition is for service reference container. This container is used as envelope to wrap around the actual endpoint reference value, when a BPEL process interacts the endpoint reference of a partnerLink. It provides pluggability of different versions of service referencing schemes being used within a BPEL program. The design pattern here is similar to those of expression language.