Re: [wsbpel] Issue 11 - Call for Discussion

3. As pointed out, this is orthogonal to type validation 
because some use
case: {while+invoke+receive+assign} require the incremental 
build out of documents. It seems that a separate issue should 
be opened to track validation (which could be addressed by 
doing validation only on the edges). More generically, any 
logic that combines sync or async interaction and build out 
of a document will not be able to be compressed into a single 
activity, companion language or not.