Parsing XML with Mojo::DOM: how to get nested nodes?

[fluca1978]

I'm not understanding well how to parse an XML file with ~Mojo::DOM. I use a path to get to the nodes that are nested, so for example with XML::LibXML` I would do:

my @nodes = $xml->findnodes( q{xocs:doc/xocs:item/item/bibrecord/head/author-group} );

that I tried to convert into a selector chain in Mojo::DOM but the following is not working:

my @nodes = $dom->find( q{xocs:doc > xocs:item > item > bibrecord > head > author-group} );

Surely I'm not understanding how the DOM is working, but is the above possible?

[kraih]

Mojo::DOM uses CSS selectors instead of XPath. There's probably CPAN modules that do the conversion for you.

[fluca1978]

Mojo::DOM uses CSS selectors instead of XPath. There's probably CPAN modules that do the conversion for you.

Yes, and the CSS selector I placed is correct.
After a few tests, it seems that Mojo::DOM is not able to handle tags with a namespace, so xocs:doc is not handled, while if I change in my XML document the tag to xocs-doc it is parsed correctly.
Is there a trick I'm not aware of to let Mojo::DOM handle tag names with namespaces?

[kraih]

No, your selector is very much incorrect. What you've written as xocs:item is a selector for an <xocs> tag with an undefined item pseudo-class.

[Akron]

There are two ways to deal with namespaces in Mojo::DOM::CSS. Either you define the namespace and use it with | as described here - or you ignore the namespace and escape the colon (that way the namespace prefix is treated as being part of the tag).

use Mojo::Base -strict;
use Mojo::DOM;

my $file = join("\n",<DATA>);

my $dom = Mojo::DOM->new->xml(1)->parse($file);

$dom->find( q{yadda|doc > item}, yadda => 'xocs-ns' )->each(sub { say $_->text });

$dom->find( q{xocs\:doc > item} )->each(sub { say $_->text });

__DATA__

<xocs:doc xmlns:xocs="xocs-ns">
  <item>hello</item>
  <item>world</item>
</xocs:doc>

[fluca1978]

@Akron thanks, I was figuring out the error in my namespace selector, so I have to rewrite it as:

$dom->find( q{xocs|doc > xocs|item > item > bibrecord > head > author-group > author},
			 xocs => q{http://www.foo.com/xml/xocs/dtd} )

that's probably the best solution.

[fluca1978]

No, your selector is very much incorrect. What you've written as xocs:item is a selector for an <xocs> tag with an undefined item pseudo-class.

Thanks, I figured out I need to use the |.