Re: Can XML::Simple not load the external subset?

On Wed, 2010-01-27 at 15:58 +1300, Jensen, John T wrote:
> I am trying to use XML::Simple because I can just slurp my data into a
> hash.  However, the xml file is filled with entities pointing to
> external xml files.  It appears that XML::Simple cannot access those.

XML::Simple doesn't actually parse XML - it delegates that to an
installed parser module.  Some of the parsers support external entities
some don't.  It sounds like the parser you're using falls into the
latter category.

If you have XML::SAX installed, then XML::Simple will use the SAX API
and it will get whichever SAX parser is configured as the default on
your system.

If you installed XML::SAX but didn't explicitly install a SAX parser
module then you're probably using the XML::SAX::PurePerl parser.  This
isn't a good idea because it's lacking in features and even when it does
work it's slow.

In my tests, XML::SAX::Expat and XML::SAX::ExpatXS both seemed to
support the external entities.  XML::LibXML::SAX seemed to duplicate the
contents of the external entities - which is mighty odd.

So in short, install XML::SAX::Expat (or if you have a compiler
available, install XML::SAX::ExpatXS) and you should be fine.

Having said all of that, I really would recommend using XML::LibXML
instead of XML::Simple, as per this article:

  http://www.perlmonks.org/index.pl?node_id=490846

Cheers
Grant


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