I checked the OASIS website for the WSA specifications as stated in chapter 11. There seems to be no such thing as a WSA spec for Web Services Architecture. There is, however a WSA spec: Web Services Addressing. I'd like to propose to change the text to:
WS-Security specification (WSS) was originally developed by Microsoft, IBM, and Verisign as part of a “Roadmap”. WSS served as the foundation for all other specifications in this domain, creating a basic infrastructure for developing message-based security exchange. Because of its importance for establishing interoperable Web Services, it was submitted to OASIS and, after undergoing the required committee process, became an officially accepted standard. Current version is 1.1.