- From: Costello, Roger L. <costello@mitre.org>
- Date: Tue, 21 Apr 2009 08:26:48 -0400
- To: "'xproc-dev@w3.org'" <xproc-dev@w3.org>
Hi Norm, >> Hi Folks, >> >> I implemented a parallel workflow in XProc. >> >> Here's a picture of it: >> >> http://www.xfront.com/parallel-workflow.gif >> >> I connected the two parallel workflows to the pipeline's input port. >> After the parallel part was done, I merged the two parallel >> workflows using an identity step. >That's all perfectly legit, but note that there's nothing about that >that requires the processor to run them in parallel. And XML Calabash >won't (at least not yet). Yes, I realize that. That's okay. I want to be able to express the parallel workflow. Whether the implementation (Calabash) actually executes it in parallel is less important to me, for now. >> QUESTION >> >> The identity step only allows me to connect its input port to the >> output of one of the parallel workflows. I'm dumping the other >> workflow's output. This seems rather bad. I can't think of what else >> to do. Can you suggest a better way to handle the merging of two >> parallel workflows? > <p:identity> > <p:input port="source"> > <p:pipe step="branch-1" name="result"/> > <p:pipe step="branch-2" name="result"/> > </p:input> > </p:identity> I tried that, and got this error: Error : Pipeline failed: err:XD0006: 2 documents appear on the 'source' port. If sequence is not specified, or has the value false, then it is a dynamic error unless exactly one document appears on the declared port. Even if it did work, what would it mean? Doesn't p:identity mean that the input flows unaltered to the output? Since there are two inputs, which one flows through to the output? /Roger
Received on Tuesday, 21 April 2009 12:27:23 UTC