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Re: Does XProc support event-driven processing?

From: Norman Walsh <ndw@nwalsh.com>
Date: Sun, 14 Jun 2009 17:21:19 -0400
To: XProc Dev <xproc-dev@w3.org>
Message-ID: <m27hzefr5c.fsf@nwalsh.com>
"Costello, Roger L." <costello@mitre.org> writes:
> Does XProc support event-driven processing?
>
> Here's an example to illustrate what I mean:
>
>    Hey, any time during the pipeline processing, 
>    if the value of <Purchase_Quantity> changes, 
>    fire a step to update <Total_Cost>.
>
> Can you think of a way to express this in XProc?

Not in the way you describe. There aren't "conditional events" "off to
the side" like that.

I'd express that as a near-identity-step that did nothing but update
the <Total_Cost>. I'd put that step after any step that might change
the quantity.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh <ndw@nwalsh.com> | Nothing is really work unless you would
http://nwalsh.com/            | rather be doing something else.--James
                              | M. Barrie

Received on Sunday, 14 June 2009 21:21:58 GMT

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