This is a pretty significant development, I think. With this work, we now have an end to end solution for exposing Tcl procs to SOAP via a simple wrapper around the proc which indicates type information (similar to how ad_proc wraps proc).
This level of simplicity is a big deal, and is comparable to .NET or Java platforms.
This work is under the MIT license, which is GPL compatible. It was funded by United eWay.
I'd encourage the OCT to take a look at this and consider it for inclusion in core.
