Hi Christain and Stian
Thank you for your help and for a very detailed answer.
It's work now. I can use default value of web services by
not to connect input port like you said.
It works well on Taverna 2.2 in my laptop.
I'm not sure what wrong with my taverna 2.3 running in another machine.
I did same way but Taverna keep running and didn't return any result.
(that why I asked this question. ) Btw, I'll check it again myself. :)
Again, thanks a lot.
Regards,
Nan
As Christian points out, to workflow input ports [1] you will need to
> provide every input as we've not got a mechanism for default workflow
> values. This applies both when running a workflow (which could suggest
> example values [2]), and when using the workflow as a nested workflow - in
> which case all input ports need to be connected in the mother workflow.
>
However on the service-level the reality is a bit different. Some services
> require you to provide a value for all inputs, and others find reasonable
> defaults. If you have not connected a port to a WSDL service, Taverna will
> try to avoid sending the required parameter if it's allowed by the schema of
> the service, alternatively it will send xsi:nil - and failing that it will
> send an empty string. (since Taverna 2.2 - earlier versions might have
> always sent an empty strings - even if say an xsd:int was expected)
>
If you want to force sending null to a WSDL service or an XML Input Splitter
> (say as part of an input list), you can connect the input port to a string
> constant with the magical value "xsi:nil" (without the quotes). [3] If you
> want to send a regular string, modify the string constant or connect the
> port to an additional workflow port or upstream service output port.
>
> (Note that the xsi:nil trick only works for WSDL services and XML input
> splitters - other services don't have a standardized way to represent "null"
> or "nothing". )
>
> [1]
>
> http://www.mygrid.org.uk/dev/wiki/display/taverna/Workflow+inputs+and+outputs[2]
> http://www.mygrid.org.uk/dev/wiki/display/taverna/Example+values [3]
>
> http://www.taverna.org.uk/documentation/faq/building-workflows/how-to-pass-null-to-a-web-service/
>
> I've also tried not to connect the input port to the workflow but it didn't
> work.
>
> You might also have to delete the workflow input port if that's what you
> are thinking off, although if it's not connected to anything in the workflow
> it should not matter.
>
> -- Stian Soiland-Reyes, myGrid team School of Computer Science The
> University of Manchester
>
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