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Re: GRDDL RDFa transformation tests results

From: Chimezie Ogbuji <ogbujic@ccf.org>
Date: Mon, 23 Apr 2007 13:12:47 -0400
To: "Fabien Gandon" <Fabien.Gandon@sophia.inria.fr>
cc: "Hausenblas, Michael" <michael.hausenblas@joanneum.at>, public-rdf-in-xhtml-tf@w3.org, "public-grddl-wg" <public-grddl-wg@w3.org>, "Dan Connolly" <connolly@w3.org>, "Harry Halpin" <hhalpin@ibiblio.org>
Message-ID: <1177348367.5534.54.camel@otherland>

Hello Fabien.  I was working on a general purpose RDFa -> RDF/XML
modality for an Atom feed over the weekend and used this transformation
stylesheet (or the one in the GRDDL WG repository:
grddl-wg/td/RDFa2RDFXML_v_0_7.xsl). I had to make some changes to get it
to work and thought you might be interested.  I didn't commit the
changes, below is a diff:

RCS file: /w3ccvs/WWW/2001/sw/grddl-wg/td/RDFa2RDFXML_v_0_7.xsl,v
retrieving revision 1.1
diff -u -b -r1.1 RDFa2RDFXML_v_0_7.xsl
--- RDFa2RDFXML_v_0_7.xsl       20 Apr 2007 12:39:52 -0000      1.1
+++ RDFa2RDFXML_v_0_7.xsl       23 Apr 2007 16:47:04 -0000
@@ -15,7 +15,7 @@
 <variable name='base' select="//*/@xml:base[position()=1]"/>
 
 <!-- url of the current XHTML page if provided by the XSLT engine -->
-<param name='url' select=""/>
+<param name='url' select="''"/>
 
 <!-- this contains the URL of the source document weither it was
provided by the base or as a parameter e.g.
http://example.org/bla/file.html-->
 <variable name='this' >
@@ -191,7 +191,7 @@
                                <value-of
select="normalize-space(substring-before($string,' '))"/>
                                <call-template
name="tokenize"><with-param name="string"
select="normalize-space(substring-after($string,'
'))"/></call-template>         
                        </when>
-                       <otherwise><text><value-of
select="$string"/></text></otherwise>
+                       <otherwise><value-of
select="$string"/></otherwise>
                </choose>
        </if>
   </template>

In particular: 1) The default value for the $url is an empty string.
The way it was before, it was not a valid XPath expression and 2)
<xsl:value-of/> cannot be used within <xsl:text>
(http://www.w3.org/TR/xslt#section-Creating-Text)

I also wondered if the lack of support for blank node CURIES (i.e.,
[_:a]) was because this is an 'unstable' feature in RDFa?

Otherwise, the transform worked wonderfully!

On Sun, 2007-04-15 at 19:53 +0200, Fabien Gandon wrote:

> Question #2: What happened to the use of "class" attribute?
> Since I found no trace of it in the tests and in the syntax, I
> deactivated its use in the transformation.

Yes, I was going to ask about this as well, but I notice there is an
ongoing discussion about it in public-rdf-in-xhtml-tf@w3.org :)

-- 
Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
ogbujic@ccf.org






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Received on Monday, 23 April 2007 17:13:08 GMT

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