Diff. between @WebService(name=... and @WebService(endpointInterface=... ?

In several tutorials I found different ways of defining a WebService with
annotated Java classes. In some samples web services are annotated like:

@javax.jws.WebService(endpointInterface="aaa)

while others declare them as:

@WebService(name = "bbb", targetNamespace = "http://......")

What is the difference?

Are these declarations Framework specific (Axis vs. JAX-WS) ?
Or are these declarations valid for ALL kind of web services?

Peter