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RE: calling for xproc pain points, requested features, etc

From: Philip Fennell <Philip.Fennell@marklogic.com>
Date: Fri, 6 Jan 2012 06:46:28 -0800
To: Geert Josten <geert.josten@dayon.nl>, Jostein Austvik Jacobsen <josteinaj@gmail.com>, "xproc-dev@w3.org" <xproc-dev@w3.org>
Message-ID: <D20C296D14127D4EBD176AD949D8A75A20556AE0AA@EXCHG-BE.marklogic.com>
+1 from me too. That's a good idea, it's something we've talked about in the Forms Working Group too for getting access to custom functions to beused in XForms' XPath expressions.

Perhaps we could have a more generalised p:import element and you have a type attribute with the appropriate mime-type (a bit like HTML's script element) where you indicate explicitly what language you are importing:

<p:import href="lib/test.xsl"/>                                                                 <!-Assumed XProc -->
<p:import href="lib/test.xsl" type="application/xslt+xml"/>             <!-XSLT -->
<p:import href="lib/test.xsl" type="application/xquery"/>                <!-XQuery -->

I believe that there's no specific registration for an XProc MIME Media Type but if anything I suppose it would be application/xproc+xml.


Regards

Philip

From: Geert Josten [mailto:geert.josten@dayon.nl]
Sent: Friday, January 06, 2012 1:34 PM
To: Jostein Austvik Jacobsen; xproc-dev@w3.org
Subject: RE: calling for xproc pain points, requested features, etc

+1 if it allows importing XQuery libraries as well.. ;-)

Grtz

Van: Jostein Austvik Jacobsen [mailto:josteinaj@gmail.com<mailto:josteinaj@gmail.com>]
Verzonden: vrijdag 6 januari 2012 11:49
Aan: xproc-dev@w3.org<mailto:xproc-dev@w3.org>
Onderwerp: Re: calling for xproc pain points, requested features, etc

I like pretty much all the suggestions on the Usability and XprovVnext wiki pages!

There's one request I have though (more of a 'revolutionary' than a 'fix whats broke' thing): I'd like to be able to reuse my XSLT2 stylesheet functions in from the XPath expressions in my XProc pipelines.

To do this today, I pass the function parameters as parameters to a p:xslt step, which has an inlined XSLT2 stylesheet that imports the stylesheet containing the xsl:function, passes the parameters to the xsl:function and then outputs the result in a c:result element. Then I retrieve the result in my XProc pipeline by reading the result document from the p:xslt steps result port.

If I could somehow just do something simliar to this, it would be awesome:

<p:pipeline ... xmlns:myns="...">
    <p:import-xslt-functions href="my-stylesheet-functions.xsl"/>
    <p:variable name="myVar" select="myns:myFunction(//paragraph, 'other-stuff')"/>
    ...
</p:pipeline>


Regards
Jostein


2012/1/6 Imsieke, Gerrit, le-tex <gerrit.imsieke@le-tex.de<mailto:gerrit.imsieke@le-tex.de>>


On 2012-01-06 05:18, Michael Sokolov wrote:
On 1/5/2012 9:46 PM, Imsieke, Gerrit, le-tex wrote:

Consider the case of an EPUB that contains XHTML files that link to
CSS stylesheets. We have implemented a CSS parser in XSLT2. In order
to make it work without too many annoying workarounds, we have to
unpack the zip file first.
We found it convenient to write a URIResolver that pulls content out of
zip files; that way we can process all the epub pieces in place without
the need for temporary files. It didn't present great difficulties,
although I may be missing something - we handled the spine and the rest,
but don't have a CSS parser - that sounds neat! But some ability to
enumerate the contents of the zip, (or to pull out the contents of a
"folder" from the zip - a kind of artificial construct) is a big help.

Sounds really neat. Have you published the resolver somewhere? For our purposes, it would have to co-operate with a catalog resolver.

FYI, the CSS parser is here:
https://github.com/gimsieke/epubcheck-xproc/blob/master/xproc/css.xpl
and of course in the XSLT files used therein, namely
https://github.com/gimsieke/epubcheck-xproc/blob/master/xsl/css-parser.xsl
https://github.com/gimsieke/epubcheck-xproc/blob/master/xsl/css2xsl.xsl
https://github.com/gimsieke/epubcheck-xproc/blob/master/xsl/css-util.xsl

It is a threee-step process:
1. For a given XHTML document, extract CSS info from linked stylesheets, inline style elements, and style attributes. Memorize priorities for every rule.
2. Generate an XSLT stylesheet out of this CSS info. The CSS priorities translate to template priorities.
3. Apply the generated XSLT stylesheet to the original XHTML file in order to make every CSS property on each element explicit as an @css:* attribute.

That is, all CSS style and class attributes will be expanded to XML attributes in the http://www.w3.org/1996/css namespace, e.g. <p css:margin-top="2em" css:color="red" css:font-family="Arial, sans-serif" class="foo"> so that you can use them for grouping, in Schematron rules, ...

Although the epubcheck-xproc project is still quite immature, the CSS parser and the mechanism to patch Schematron findings back into the HTML files (step epub:schematron-spinehtml in the https://github.com/gimsieke/epubcheck-xproc/blob/master/xproc/epub.xpl library) is already quite usable.

Gerrit
Received on Friday, 6 January 2012 14:46:56 GMT

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