Phil Windley muses on Leve 5 routing for web services:
Last night I couldn’t sleep, so I started to put together some thoughts I’d been having lately regarding web services and level 5 routing. Some might want to quibble and call it level 4, but since the transport for SOAP is HTTP (a level four protocol), I’ll call it level 5. The idea is pretty simple: the advent of standards for application integration has brought us to the point where applications can be put together by scripting calls to existing services.