Given this oversimplified XML file:
<Foo>Bar</Foo>
And this code which extracts the value for the Foo element:
use XML::Rabbit;
use Data::Dump::Tree;
class RunInfo does XML::Rabbit::Node {
has $.foo is xpath("/Foo");
}
sub MAIN ( $file! ) {
my $xml = RunInfo.new( file => $file );
dump $xml;
put "-----------------------";
put "Foo is $xml.foo()";
}
You'll see that the value for foo is Nil, even though the output shows Foo is Bar:
.RunInfo @0 ├ $.foo = Nil ├ $.context is rw = .XML::Document @1 │ ├ $.version = 1.0.Str │ ├ $.encoding = Nil │ ├ %.doctype = {0} @2 │ ├ $.root = .XML::Element @3 │ │ ├ $.name is rw = Foo.Str │ │ ├ @.nodes is rw = [1] @4 │ │ │ └ 0 = .XML::Text @5 │ │ │ ├ $.text = Bar.Str │ │ │ └ $.parent is rw = .XML::Element §3 │ │ ├ %.attribs is rw = {0} @7 │ │ ├ $.idattr is rw = id.Str │ │ └ $.parent is rw = .XML::Document §1 │ ├ $.filename = example.xml.Str │ └ $.parent is rw = Nil └ $.xpath is rw = .XML::XPath @9 ├ $.document = .XML::Document §1 └ %.registered-namespaces is rw = {0} @11 ----------------------- Foo is Bar
(Disclaimer: I came across this behavior today in my code, so I wrote it up Q & A style. Other answers welcome.).
By the way, here are links to XML::Rabbit and Data::Dump::Tree.