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RE: [Serial] additional last call comment about xml:lang

From: Martin Duerst <duerst@w3.org>
Date: Thu, 27 May 2004 16:25:31 +0900
Message-Id: <4.2.0.58.J.20040527154013.070d71c8@localhost>
To: "Michael Kay" <mhk@mhk.me.uk>, <public-qt-comments@w3.org>
Cc: <w3c-i18n-ig@w3.org>, "'Liam Quin'" <liam@w3.org>

At 08:47 04/05/26 +0100, Michael Kay wrote:

> > Hello Michael,
> >
> > Are you saying that this can indeed be done with a single invocation
> > of an XSLT implementation, with a single stylesheet? Your use of
> > "pre-processing phase" and so on in your previous mail wasn't
> > totally clear on this, at least not for me.
>
>Yes, it can all be done within a single transformation in a single
>stylesheet.

This sounds great!

> > If this is true, it would be very nice, and I would assume that our
> > WG would then be very happy with the result. For our reference, can
> > you please either point to the section in the spec where this
> > multi-pass thing is described, or can you resend the code in
> > your earlier mail with some framework code added that shows how
> > to define the various passes?
>
>There's a simple example showing how temporary trees can be used to support
>multi-phase transformations in section 9.4 of the spec:
>
>http://www.w3.org/TR/xslt20/#temporary-trees
>
>I'm afraid I'm too busy today to do a worked example for you.

Okay, I took this example, and the code fragments that you sent
earlier, and put something together below. I'd appreciate if you
could check it. I'm not sure I got everything right, in particular
all the modes.

How to create a stlyesheet that cleanly copies xml:lang:
[assuming for simplicity that all xml:lang information
is comming from the source, not from the stylesheet, and
that only whole elements are transferred, not independent
textual pieces]
[I'm using a tree-pass solution; this could be done in
many cases as a two-pass solution]

- Start with your stylesheet.
- Make sure that on all elements, xml:lang is copied.
- Assumes that the main mode for the original stylesheet
   is the default mode.


<xsl:stylesheet
   version="2.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="*" mode="expandXmlLang">
   <xsl:copy>
     <xsl:copy-of select="@* | ancestor-or-self::*/@xml:lang[last()]"/>
     <xsl:apply-templates mode="expandXmlLang"/>
   </xsl:copy>
</xsl:template>

<xsl:template match="*" mode="cleanXmlLang">
   <xsl:copy>
     <xsl:copy-of select="@* except @xml:lang[. =
ancestor::*/@xml:lang[last()]]"/>
     <xsl:apply-templates mode="cleanXmlLang"/>
   </xsl:copy>
</xsl:template>

<!-- rest of your stylesheet here or somewhere -->

<xsl:variable name="xmlLangExpanded">
   <xsl:apply-templates select="/" mode="expandXmlLang"/>
</xsl:variable>

<xsl:variable name="processedMain">
   <xsl:apply-templates select="$xmlLangExpanded" mode="#default"/>
</xsl:variable>

<xsl:template match="/">
   <xsl:apply-templates select"$processedMain" mode="cleanXmlLang"/>
<xsl:template>
</xsl:stylesheet>


Regards,     Martin.
Received on Thursday, 27 May 2004 04:19:44 GMT

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