According to literature on the web, I can see that there are two specifications related to Web Services Eventing:
To me, both seem to have the same functionality. What is the most acceptable specification in the industry now?
I think most people these days would not use SOAP but rather rely on simpler protocols (AMQP/JMS in this case) but if you do need/want to use SOAP WS-Notification (which is the parent standard for WS-BaseNotification) is the more widely supported protocol (e.g. by ServiceMix or IBM WebSphere)