Learning by example can work very well for some people, but there's always a
danger that you miss some of the concepts - or even worse, that you build an
incorrect mental model of why the examples work. It's a good idea to
supplement it with some reading about the concepts in the language.
In this case, you don't seem to have grasped the correct model for
namespaces. Element names are "QNames", consisting of a namespace URI and a
local name; the prefix is a local shortcut for an URI. For an XPath step to
match an element name, the namespace URIs and local names have to match; the
prefixes are irrelevant. The name of your root element has namespace URI
http://docbook.org/docbook-ng, local name chapter, and it will only match a
corresponding step in a path expression.
If you're using XSLT 1.0, declare a prefix for this namespace in your
xsl:stylesheet element
xmlns:db="http://docbook.org/docbook-ng";
and then select the element as db:chapter.
If you're using XSLT 2.0 another option is to declare the namespace for
unprefixed names in path expressions:
xpath-default-namespace="http://docbook.org/docbook-ng";
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
-----Original Message-----
From: Catherine Pouncett
[mailto:C(_dot_)Pouncett(_at_)autodata(_dot_)ltd(_dot_)uk]
Sent: 22 June 2009 10:09
To: XSL Wrox forum (E-mail)
Subject: [xsl] Xpath errors in XML to XML transformation
Hi,
This is my first post on this forum, I'm just beginning
to learn XSL. Working with simple examples is going great. I
have now come across a problem and do not know how to sort it
out and I wondered if someone could point me in the right direction?
I have managed to transform XML to XML etc using simple
examples. Then I took some of my work files, things weren't
working, when checking my Xpath, the results were coming up
false etc. We have lots of info in the top tag 'chapter', if
I remove everything apart from the namespace ad declaration
the file transforms correctly. So, does this have something
to do with the Schema? or, docbook?
Any help on this would be much appreciated as I don't
know where to start looking.
Xpath works perfectly with the below root tag in my XML files:-
<chapter xmlns:ad="http://myhome/technical_topic";>
Xpath does not work with the below root tag in my XML files:-
<chapter xmlns="http://docbook.org/docbook-ng";
xmlns:ad="http://myhome/technical_topic";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://docbook.org/docbook-ng
//myserver/myfolder/XmlSchemaStylesheet/docbook.xsd"
version="IPA-ext-Caffs-0.5" xml:lang="en">
Hope this makes sense.
Kind Regards,
Catherine
Catherine Pouncett
tel: +44 1628 688182
c(_dot_)pouncett(_at_)autodata(_dot_)ltd(_dot_)uk
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