[OWSLib-users] Process Chaining

[Suzana Barreto]

Hi All,

I have been trying to chain process requests using OWSLib and PyWPS server
but have not been too successful.  I have been able to fire separate
requests off in order using the output from one as input to the next but I
would specifically like to be able to chain them through embedding.  I have
attempted to use the WPSExecution object to build my requests by embedding
a request as the input of the second request but have found that the xml
for the embedded request ends up being escaped and malformed.  Looking at
the ComplexDataInput class, I notice that this can only be a
ComplexReference type or a ComplexDataRaw type but it appears that it
always evaluates to the reference type so my embedded query is then escaped
and appears in the HREF tag of the input data.  I have also tried to create
a manual xml document but cannot find the correct XML element that
identifies the embedded request.  So what I am asking is if anyone knows or
can point me to an example showing how chaining is achieved, or
alternatively the correct XML structure for an embedded / chained request.

Thank you,
Suzana

-- 



*Dr Suzana BarretoSoftware AnalystEnvironment Systems*
Tel: +44 (0) 1970 626688
www.envsys.co.uk

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