Re: External references in xml headers

[email protected] schrieb:
>   Sorry for newbie question but i cannot figure out how to resolve
> following problems. There are references to  the dtd files at the
> beginning of xml files:
>
> 1)  If there is external references to public dts's like
> 'http://www.w3.org/TR/REC-SMIL/SMIL10.dtd' the parser (XML::SPath)
> sometimes dies due to network or access error to given url.

I guess you mean XML::XPath. This may work fine, but hasn't seen any
updates in a while. Personally, I'd rather use XML::LibXML, which is
the Perl interface to the C library LibXML2, and definitely works a lot
better.

> 2) Sometimes there is only reference to SMIL10.dtd with no other
> information and the parser also fails in this case.

Can you give the exact line containing this reference?

In case this reference simply will not resolve to a DTD (because there
is none), the document is broken and the reference should be removed. As
a workaround, then, in XML::LibXML, simply do the following:

     use strict;
     use warnings;
     use XML::LibXML;
     my $fnam = shift or die "Datei uebergeben";
     my $parser = XML::LibXML->new;
     $parser->load_ext_dtd(0);
     my $doc = $parser->parse_file($fnam);

>   I have read  a mechanism called catalogs and made a file
> /etc/xml/catalog but there is something missing, that file
> is not even read during xml parsing.

This is basically a local cache of publicly available DTDs. Very useful!
Where it is on your system, is, well, system-specific. In XML::LibXML,
it can be configured via load_catalog($file). See XML::LibXML::Parser.
Yes, another reason to use XML::LibXML.

use strict;
use warnings;
use XML::LibXML;
my $fnam = shift or die "Datei uebergeben";
my $fnam_xml_cat = shift || '/usr/share/xml/schema/xml-core/catalog.xml';
my $parser = XML::LibXML->new;
$parser->load_catalog( $fnam_xml_cat );
my $doc = $parser->parse_file( $fnam );

Michael Ludwig
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