> James,
>
>> Unfortunately, connecting the 2 processors did not work.
>
> hmm - ok. I think connecting the processors is only part of the
> solution. In your example code, the output of the second processor is
> still in no way dependend on the output of the first one, so "lazy
> evaluation" still may omit the first processor when generating the
> output of the second one.
>
> If this is correct, one solution would be to make the output of both
> processors relevant to the reslut of the XPL, for example by aggregating
> them (using the identity processor [1]), or by evaluating the content of
> the first processor's output. In pseudocode:
>
> p:pipeline input=in output=out
> p:processor id=first, input=#in output=firstresult (true|false)
> p:choose href=#firstresult
> p:when test=true
> p:processor id=second output=finalresult ref=out
> p:otherwise
> (generate null document, throw exception or anything else)
> /p:choose
> /p:pipeline
>
> Another (and easier) solution would be to let the "Null serializer" [2]
> consume the output of the first processor. This way, the XPL engine has
> to access the output of the first processor, but just to discard it.
> Pseudocode again:
>
> p:pipeline input=in output=out
> p:processor id=first, input=#in output=firstresult
> p:nullserializer input=#firstresult (no output, sort of /dev/null)
>
> p:processor id=second output=finalresult ref=out
> /p:pipeline
>
> If the second processor depends on the succesful execution of the first
> one, i would recommend using p:choose (as in my first example) to
> express this dependency explicitly in the XPL code.
>
> HTW (hope this works ;) )
> florian
>
>
> [1]
>
http://wiki.orbeon.com/forms/doc/developer-guide/processors-other#TOC-Identity-processor> [2]
>
http://wiki.orbeon.com/forms/doc/developer-guide/processors-other-serializers#TOC-Null-serializer>
>
>
>
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