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RE: Query for particular use case

From: <vojtech.toman@emc.com>
Date: Fri, 23 Mar 2012 09:34:30 -0400
To: <xproc-dev@w3.org>
Message-ID: <3799D0FD120AD940B731A37E36DAF3FE34237C667B@MX20A.corp.emc.com>
Lewis,

Just to be sure, when you say that: "I see that there seems to be no existing implementation for running a custom program within the XML pipeline either in the standard XProc steps, the EXProc proposals, the Calabash Extension steps..." - are you aware of the standard p:exec step? This step is in the XProc specification exactly to allow running custom programs from within XProc pipelines.

For a more robust (flexible/efficient/easier to use/...) integration with external tools, the best practice often is to create extension steps - an example are the zip/unzip EXProc steps, but you can create your own if you want. The exact mechanics of how this is done depend on the particular XProc processor.

Extension steps provide a reasonable balance between flexibility and tight coupling to specific programs. Because of the separation between the step declaration and its actual implementation, changing the implementation or even switching to a completely new one is often possible without affecting the pipeline.

Regards, 
Vojtech


--
Vojtech Toman
Consultant Software Engineer
EMC | Information Intelligence Group
vojtech.toman@emc.com
http://developer.emc.com/xmltech


> -----Original Message-----
> From: McGibbney, Lewis John [mailto:Lewis.McGibbney@gcu.ac.uk]
> Sent: Friday, March 23, 2012 2:14 PM
> To: xproc-dev@w3.org
> Subject: RE: Query for particular use case
> 
> Hi Again,
> 
> I should have mentioned when I posted this, I'm using Calabash 1.0.0
> for my XProc implementations.
> 
> In addition to the original example presented in the link I posted in
> [0], I see that there seems to be no existing implementation for
> running a custom program within the XML pipeline either in the standard
> XProc steps, the EXProc proposals, the Calabash Extension steps or
> indeed the MarkLogic XCC steps. [2]
> 
> Has anyone else got a use case driven approach to implementing (at some
> stage within a pipeline) execution of a custom program, before
> progressing with more standard XProc steps? The reason I'm hovering
> over this topic is that it makes it really neat and compact if it can
> be run within XProc as I may wish to do several executions of different
> custom programs from within one pipeline, in-between which I would do
> schema validation.
> 
> Again, thanks for any feedback or comments.
> 
> Best
> 
> Lewis
> 
> [2] http://xmlcalabash.com/docs/reference/
> ________________________________________
> From: McGibbney, Lewis John [Lewis.McGibbney@gcu.ac.uk]
> Sent: 17 March 2012 14:20
> To: xproc-dev@w3.org
> Subject: Query for particular use case
> 
> Hi Everyone,
> 
> I found the following use case [0], for running a custom program within
> the XProc pipeline. Please let me put this into context
> 
> I'm currently working with GATE [1] to do a bunch of stuff to XML such
> as annotate it with domain specific grammars. It would be really really
> nice if I could runs a series of GATE processing resources within my
> XProc pipeline, then do something like schema validation and possibly
> another XSLT before the end of the pipeline... the material seems to be
> very thin on the ground so I thought I would come over to the dev list
> to see what the perceptions/current implementations and practice
> actually are w.r.t running custom programs within the XProc pipeline.
> I've not been able to find anything on the MarMail archives either.
> 
> Additionally I would be really really keen to contribute some
> documentation to [0] if and when I make some reasonable progress with
> this.
> 
> Thank you very much in advance for any comments/direction.
> 
> Lewis
> 
> [0] http://www.w3.org/TR/xproc-requirements/#use-case-run-program
> [1] http://gate.ac.uk/
> 
> Glasgow Caledonian University is a registered Scottish charity, number
> SC021474
> 
> Winner: Times Higher Education's Widening Participation Initiative of
> the Year 2009 and Herald Society's Education Initiative of the Year
> 2009.
> http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,62
> 19,en.html
> 
> Winner: Times Higher Education's Outstanding Support for Early Career
> Researchers of the Year 2010, GCU as a lead with Universities Scotland
> partners.
> http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,15
> 691,en.html
> 
> Glasgow Caledonian University is a registered Scottish charity, number
> SC021474
> 
> Winner: Times Higher Education's Widening Participation Initiative of
> the Year 2009 and Herald Society's Education Initiative of the Year
> 2009.
> http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,62
> 19,en.html
> 
> Winner: Times Higher Education's Outstanding Support for Early Career
> Researchers of the Year 2010, GCU as a lead with Universities Scotland
> partners.
> http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,15
> 691,en.html
> 
Received on Friday, 23 March 2012 13:35:25 GMT

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