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Re: Initial impressions [was: Re: try/catch with messages]

From: Imsieke, Gerrit, le-tex <gerrit.imsieke@le-tex.de>
Date: Wed, 23 Apr 2014 13:49:23 +0200
Message-ID: <5357A8C3.3040504@le-tex.de>
To: xproc-dev@w3.org
For messages, you may use cx:message [1]. Just import this:
<p:import href="http://xmlcalabash.com/extension/steps/library-1.0.xpl" />

Usage example (taken from [2]):
<cx:message>
   <p:with-option name="message" select="concat('COVER: ', 
/epub-config/cover/@href)">
     <p:pipe port="meta" step="create-ops"/>
   </p:with-option>
</cx:message>

You’ll find plenty of (more or less) working XProc examples linked on 
our transpect page [3]. One of the less complex is the CSS→CSSa 
converter [4]. Please note that you’ll have to check it out with an SVN 
client to get all externals.

Gerrit

[1] http://xmlcalabash.com/docs/reference/cx-message.html
[2] 
https://subversion.le-tex.de/common/epubtools/modules/create-ops/xpl/create-ops.xpl
[3] http://www.le-tex.de/en/transpect.html#transpect-modules
[4] https://subversion.le-tex.de/common/sandbox/css_expand_standalone/trunk/

On 23.04.2014 12:39, Graham Seaman wrote:
> On 17/04/14 11:33, James Fuller wrote:
>> Graham,
>>
>> nice job sticking with it ... xproc has a difficult learning curve
>> which we (as in the W3C XML Processing WG) are trying to address in
>> vnext.
>>
>> Be interested in your fresh impressions, to see what you found
>> confusing, useful , etc.
>>
>> cheers, Jim Fuller
>>
>
> I'd say the thing which has probably slowed me down most is an inability
> to do simple debugging easily: a p:message as an equivalent to a 'print'
> statement in other languages, or a more flexible p:log.
>
> I've now more or less managed to create the pipeline that I wanted.
> However, since this pipeline is meant to carry out a series of
> validation steps the difficulty in getting back diagnostic information
> when something unexpected goes wrong does limit its usefulness.
>
> Looking forward to seeing the new version!
>
> Cheers
>
> Graham
>
>
>
>

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Gerrit Imsieke
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Received on Wednesday, 23 April 2014 11:49:50 UTC

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