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Re: output binding error?

From: Norman Walsh <ndw@nwalsh.com>
Date: Fri, 26 Sep 2008 09:12:58 -0400
To: XProc Dev <xproc-dev@w3.org>
Message-ID: <m2abdvm4o5.fsf@nwalsh.com>
James Garriss <james@garriss.org> writes:

> So we can't bind an input port in the declaration.  Can we bind one when we
> specify (use) it?  IOW, is this legal pipeline code?

Yes. In fact, *all* inputs must be bound when you *use* a step. If you
don't specify a primary input/output port, it'll get bound

All *primary* output ports must also be bound (implicitly or
explicitly) when you use a step. Output ports that aren't primary can
be left unbound, in which case any data that flows throw them "falls
on the floor" (i.e. gets silently discarded).

> <p:declare-step xmlns:p="http://www.w3.org/ns/xproc" name="main">
>     <p:input port="source">
>         <p:document href="BookStore.xml"/>
>     </p:input>
>     <p:output port="result">
>         <p:empty/>
>     </p:output>
>     <p:sink>
>         <p:input port="source">                                <!-- can I do
> this? -->
>             <p:pipe step="main" port="source"/>
>         </p:input>
>     </p:sink>
> </p:declare-step>

Perfectly legit.

                                        Be seeing you,

Norman Walsh <ndw@nwalsh.com> | Everything has been said before, but
http://nwalsh.com/            | since nobody every listens we have to
                              | keep going back and beginning all over
                              | again.--André Gide

Received on Friday, 26 September 2008 13:13:40 UTC

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