Sam Ruby writes;
The very notion of a link has become practically inexpressible and virtually unthinkable in the vernacular of SOA.
That’s an awesome soundbite, but I don’t think that’s the (whole) problem because SOA/WS does have links, they’re called EPRs.
But what SOA doesn’t offer, is a uniform interface for the targets of those links, and a uniform interface is what gives the links most of their value as each one contains sufficient information to initiate a subsequent action (e.g. GET).
There’s a unique symbiotic relationship between links and the uniform interface that makes the whole greater than the sum of the parts; individually they’re useful, but together they changed the world.