W3C home > Mailing lists > Public > xproc-dev@w3.org > October 2013

Re: No more parameter ports

From: David Cramer <david@thingbag.net>
Date: Tue, 08 Oct 2013 10:59:34 -0500
Message-ID: <52542BE6.8050105@thingbag.net>
To: Norman Walsh <ndw@nwalsh.com>, XProc Dev <xproc-dev@w3.org>
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On 10/08/2013 10:44 AM, Norman Walsh wrote:
...
> Not inventing a new mechanism would mean that p:with-param would
> still exist but parameter ports would not. Consider this pipeline:
> 
> <p:declare-step name="main"> <p:input port="source"/> <p:output
> port="result"/> <p:option name="page-size" select="'A4'"/>
> 
> <p:xslt> <p:input port="stylesheet"> <p:document
> href="style.xsl"/> </p:input> <p:with-param name="page-size"
> select="$page-size"/> <p:with-param name="style"
> select="'draft'"/> </p:xslt> </p:declare-step>
> 
> Without parameter ports that would be valid (no more stupid
> warnings about unbound parameter input ports, thank you very
> much!)
> 
> The pipeline caller could change the value of the 'page-size' 
> parameter by passing in the page-size option to the pipeline. They 
> could not change the value of the 'style' parameter or pass in any 
> other parameters.

Would you have to specifiy every parameter in the pipeline that could
be passed in to the step? Would you also have to specify a defaut
value for it? Thinking of the DocBook xslts, which have many params
with sensible defaults set, you don't want to HAVE to repeat the full
list of allowed params and their defaults in the xpl. I suppose you
could generate part of your pipeline from your xslts, but that's just
moving the work and complexity to another place.

Regards,
David
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Received on Tuesday, 8 October 2013 16:00:06 UTC

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