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RE: "xmlns" problem for transform

Subject: RE: "xmlns" problem for transform
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Wed, 3 Aug 2005 21:54:16 +0100
ivoa rss
It's nothing to do with the presence or absence of a schema, it's all to do
with the fact that X in namespace N is completely unrelated to X in
namespace N2, or X in no namespace.

You shouldn't get yourself into this situation where the same vocabulary of
local names is used in more than one namespace. But if you do (as RSS users
do) the best way is to write your transformation on the assumption that the
names are in a namespace, and then write a preprocessing transformation
where necessary to put them in that namespace. This is essentially a variant
on the identity transform:

<xsl:template match="*[namespace-uri()='']">
  <xsl:element name="{local-name()}" namespace="the.real.namespace">
    <xsl:copy-of select="@*"/>
    <xsl:apply-templates/>
  </xsl:element>
</xsl:template>

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: Chenzhou Cui [mailto:ccz@xxxxxxxxx] 
> Sent: 03 August 2005 21:29
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  "xmlns" problem for transform
> 
> Dear Joris:
> 
> Thank you very much! Now the problem is PARTLY solved. After 
> I add the 
> non-default namespace for my xslt filter and all needed prefix, the 
> filter works well with schema assigned data files. However, 
> it can not 
> transform files without schema. An opposite problem to before.
> 
> How can I do?
> 
> cheers,
> 
> Joris Gillis wrote:
> 
> > Hi,
> >
> > Tempore 21:02:56, die 08/03/2005 AD, hinc in 
> > xsl-list@xxxxxxxxxxxxxxxxxxxxxx scripsit Chenzhou Cui 
> <ccz@xxxxxxxxx>:
> >
> >> it can't transform
> >> the body of sample file with "schema" assigned.
> >
> >
> > As the post's subject indicates, this is a 
> namespace-related problem 
> > indeed.
> >
> > The schema sets the default namespace to 
> > "http://www.ivoa.net/xml/VOTable/v1.1", you need to define in your 
> > xslt a namespace with this uri and a chosen prefix (I know 
> > 'xmlns="http://www.ivoa.net/xml/VOTable/v1.1"' is already 
> present; you 
> > need to add another non-default namespace declaration). e.g. 
> > 'xmlns:VOT="http://www.ivoa.net/xml/VOTable/v1.1"'
> >
> > Next step is to find all element names in any xpath expression or 
> > pattern in your xslt and add the prefix.
> >
> > e.g. <xsl:for-each select="//RESOURCE/TABLE/FIELD" /> becomes
> >
> > <xsl:for-each select="//VOT:RESOURCE/VOT:TABLE/VOT:FIELD"/>
> >
> > regards,
> 
> 
> -- 
> ============================================================
> Chenzhou Cui  (Chinese Virtual Observatory: China-VO)
> National Astronomical Observatory | Tel: (8610)64841695
> Chinese Academy of Sciences       | FAX: (8610)64878240
> 20A Datun Road, Chaoyang District | Email: ccz@xxxxxxxxx
> Beijing 100012, China             | WWW: www.lamost.org/~cb
> ============================================================

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