Re: xpathscript command line utility - a bit more info and a YPathScript question.

Wed, 06 Apr 2005 17:15:50 -0700 

I've done a bit more testing on my /usr/bin/xpathscript problem.

It appears that /usr/bin/xpathscript uses XML::LibXML as the default document type - rather than XML::XPath - which is what it uses under AxKit!
(at least those are the package names that appear in error messages.)

If I amend my code to use XML::LibXML commands then I can get the script to work OK on the command line.
But it then (obviously) doesn't run under XPathScript in AxKit.

SO - /usr/bin/xpathscript question:
- why is it using XML::LibXML?

I then switched to using YPathScript for XPS files in AxKit - which I have built to use XML::LibXML.
and tried processing the same XPS that worked on the commandline
which failed with two sorts of errors
- relative paths in the XPATH 'document' function don't seem to work
- and I can't get the namespaces to work when loading another document
(The previous version of this XPS file worked fine under AXKit and XML::XPath.)


Relative Path details:

I need to load an XML document stored relative to the XPS stylesheet.
Using findnodes

    14 our $xpfo=findnodes("document('$xmlfile')/*")->get_node(1)

but this doesn't load anything unless I specify a full server path

14 our $xpfo=findnodes("document('http://www.datalucid.co.uk/DRE/$xmlfile')/*")->get_node(1);


Document Namespace

This $xmlfile document declares a namespace for all nodes

3 <classes xmlns="http://www.datalucid.com/"; xmlns:dl='http://www.datalucid.com/'>

But I can't workout how to refer to this namespace in YPathScript
as - if I don't specify a namespace on nodes - they don't get found.

But - if I do - using the 'dl:' prefix:
31 my $foclass=$xpfo->findnodes('dl:[EMAIL PROTECTED]"'.$class.'"]');
I get the following error message in the browser and the Apache error_log:

The following error occurred: Undefined namespace prefix xmlXPathCompiledEval: evaluation failed


SO - the YPathScript questions are:
- what am I doing wrong with relative document paths
- how do I use / set a namespace when searching another document


Again - as always - any sort of help or comments would be much appreciated.


Mike Trotman wrote:

Hi.

I've just tried using the commandline utility '/usr/bin/xpathscript' to check some of my XPS files
(and make sure I can generate output from the commandline).
I've been testing a design for an application using Axkit for the last couple of weeks - but that's the 1st time I started using it.

I've had problems and narrowed them down to the following XPS file
(which is a subset of a much larger XPS file that works fine when running under AxKit.)

Any help on how I get this to work would be greatly appreciated.

1 <%
2 my $xpfo=findnodes('document("/DRE/fostyle/dl_fostyles.xml")/classes')->get_node(1); 

     3
     4 unless ($xpfo)  {
     5         print "NO XPFO\n";
     6         exit 999;
     7         }
     8 #------------------------------------------------------------
     9 %>
    10 <%= apply_templates('/');       %>

If I run this file with

[DRE]$ xpathscript tab_0001.xml test.xps

I get output:

syntax error at stylesheet line 10, at EOF
syntax error at stylesheet line 13, near ";
                   }"
 (Might be a runaway multi-line || string starting on line 11)


If I change the last line to

    10 <% print apply_templates('/');   %>

it sort of works and I get output:

NO XPFO

(but I really need that $xpfo document!
and the full file works fine under AxKit!)
If I remove the check for $xpfo then I do get the XML document output.

I think am running the latest version of Apache::AxKit::Language::XPathscript etc.

cpan> m XML::XPathScript
Module id = XML::XPathScript
   CPAN_USERID  DOMQ (Dominique Quatravaux <[EMAIL PROTECTED]>)
   CPAN_VERSION 0.14
   CPAN_FILE    D/DO/DOMQ/XML-XPathScript-0.14.tar.gz
   MANPAGE      XML::XPathScript - a Perl framework for XML stylesheets
   INST_FILE    /usr/lib/perl5/site_perl/5.8.3/XML/XPathScript.pm
   INST_VERSION 0.14

(although the /usr/bin/xpathscript says it is version 0.2)

cpan> m Apache::AxKit::Language::XPathScript
Module id = Apache::AxKit::Language::XPathScript
CPAN_USERID MSERGEANT (Matt Sergeant <[EMAIL PROTECTED]>)
CPAN_VERSION 0.05
CPAN_FILE M/MS/MSERGEANT/AxKit-1.6.2.tar.gz
MANPAGE Apache::AxKit::Language::XPathScript - An XML Stylesheet Language
INST_FILE /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi/Apache/AxKit/Language/XPathScript.pm 

   INST_VERSION 0.05

and - just in case ...

cpan> m Apache::AxKit::Language::YPathScript
Module id = Apache::AxKit::Language::YPathScript
CPAN_USERID DOMQ (Dominique Quatravaux <[EMAIL PROTECTED]>)
CPAN_VERSION 1.1
CPAN_FILE D/DO/DOMQ/XML-XPathScript-0.14.tar.gz
MANPAGE Apache::AxKit::Language::YPathScript - An XML Stylesheet Language
INST_FILE /usr/lib/perl5/site_perl/5.8.3/Apache/AxKit/Language/YPathScript.pm
INST_VERSION 1.1

I built YPathscript to use XML::LibXML.

Any clues, hints, suggestions, pointing out obvious mistakes most welcome.

Mike


--
Datalucid Limited



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