WSFL was proposed to be layered on top of Web Services Description Language.
In 2003 IBM and Microsoft combined WSFL and Xlang to BPEL4WS and submitted it to OASIS for standardization.
Oasis published BPEL4WS as WS-BPEL to properly fit the naming of other WS-* standards.
Web Services Endpoint Language (WSEL) was an XML format proposed to be used to description of non-operational characteristics of service endpoints, such as quality-of-service, cost, or security properties.
Format was proposed as a part of report which published Web Service Flow Language .