Simply providing a forum for people to ask questions and discuss ideas isn"t going to help solve interoperability issues.
Therefore, it is logical to conclude that this aspect of interoperability has not been formally tested as part of WS-I compliance.
However, since this is an interoperability demonstration, you want to be able to test multiple remote web services with it.
To prompt broader semantic interoperability, IBM has been a strong supporter for various industry standards.
The standardization of workflow behavior and interoperability is late to this game, trying to standardize everything all at once.
How much interoperability is enough, or too much, is impossible to know in advance.
Also, keep in mind that this flexibility has a downside: it may cause interoperability problems between Web service implementations.
Additionally, there are inherent problems with the point in time nature of the current interoperability testing.
You want to be sure not to create a false sense of security about the interoperability you might have with others using the same standard.
Its powerful strength turns out to be its weakness in the face of the demand for interoperability across platforms.