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Re: XS0006 necessary here?

From: Manfred Staudinger <manfred.staudinger@gmail.com>
Date: Wed, 23 Sep 2009 19:51:52 +0200
Message-ID: <a946be3a0909231051g287dda8eif6be859b3c1316d7@mail.gmail.com>
To: Toman_Vojtech@emc.com
Cc: xproc-dev@w3.org
You are right, I was confused by that error message (it prompted my
trial and error session). But your concise and detailed explanation
was very helpfull in getting a better understanding, thank you.

Regards,
Manfred

On 22/09/2009, Toman_Vojtech@emc.com <Toman_Vojtech@emc.com> wrote:
>> Beginner errors: when I execute (from the command line)
>> <p:declare-step name="myPipeline"
>>        xmlns:c="http://www.w3.org/ns/xproc-step"
>>        xmlns:p="http://www.w3.org/ns/xproc">
>> 	<p:identity>
>> 		<p:input port="source">
>> 			<p:inline>
>> <c:directory><c:file name="aber.xml"/></c:directory>
>> 			</p:inline>
>> 		</p:input>
>> 	</p:identity>
>> 	<p:make-absolute-uris match="c:directory/*/@name">
>> 		<p:with-option name="base-uri"
>> select="'file:/J:/test/'"/>
>> 	</p:make-absolute-uris>
>> </p:declare-step>
>> then Calabash 0.9.14 gives me
>> Error  : file:/J:/bauer/planavi/dirs/x-show-err1.xpl:4: Unbound
>> primary output port on last step: myPipeline
>> Error  : Pipeline failed: err:XS0006: Unbound primary output port on
>> last step: myPipeline  It is a static error if the primary output port
>> has no binding and the last step in the subpipeline does not have a
>> primary output port.
>> but Calumet 1.0.9 executes and outputs
>> <c:directory xmlns:c="http://www.w3.org/ns/xproc-step"><c:file
>> name="file:/J:/test/aber.xml"/></c:directory>
>
> The current (28 May 2009) version of the XProc spec says (in Section
> 2.3): "Additionally, if a compound step has no declared outputs and the
> last step in its subpipeline has an unbound primary output, then an
> implicit primary output port will be added to the compound step (and
> consequently the last step's primary output will be bound to it)."
>
> This clearly the case with your pipeline: it declares no output ports,
> but the last step in the sub-pipeline (p:make-absolute-uris) has an
> unconnected primary output port (i.e. there is nothing that consumes the
> result of the step). So according to the spec, the processors should add
> an implicit primary output port to the main pipeline - which both seem
> to have done.
>
> In the case of Calumet, you seem to get the right behavior. However, in
> the case of Calabash, the implicit primary output seems to cause
> problems, at least judging based on err:XS0006 and the error message you
> get ("Unbound primary output port on last step: myPipeline").
>
> However, note that when the new version of the XProc specification is
> published, the behavior related to adding implicit primary output ports
> will change: it will not apply for step declarations (p:declare-step and
> p:pipeline) any more as they will always have to specify all output
> ports explicitly.
>
> Regards,
> Vojtech
>
> --
> Vojtech Toman
> Principal Software Engineer
> EMC Corporation
> toman_vojtech@emc.com
> http://developer.emc.com/xmltech
>
>
Received on Wednesday, 23 September 2009 17:52:33 GMT

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