How can I auto-indent XML nodes with XML::LibXML?

Question

I\'m adding nodes to my XML document as part some in-house processing, but cannot get XML::LibXML to auto-indent the added nodes.

I get output like the following:

Answer 1

I played a bit with settings and this seems to work:

use XML::LibXML;

my $doc = XML::LibXML->load_xml(string => <<END_XML, { no_blanks => 1 });
                                    <nested_nodes>
                                        <nested_node>
                                        <configuration>A</configuration>
                                        <model>45</model>
                                        <added_node>
        <ID>
            <type>D</type>
            <serial>3</serial>
            <kVal>3</kVal>
        </ID>
    </added_node>
</nested_node>
                                    </nested_nodes>
END_XML

print $doc->toString(1);

Result is this:

<?xml version="1.0"?>
<nested_nodes>
  <nested_node>
    <configuration>A</configuration>
    <model>45</model>
    <added_node>
      <ID>
        <type>D</type>
        <serial>3</serial>
        <kVal>3</kVal>
      </ID>
    </added_node>
  </nested_node>
</nested_nodes>

Answer 2

If you don't mind using another tool, I recommend XML::Tidy. It does one job, and it does it well.