Alice 40000 Bob 37500 ##
##

{
  package MegaCorp::Person;
  use XML::LibXML::Augment
    -names => ['{http://megacorp.example/}person'];

  sub get_salary {
    shift
      -> getElementsByTagName('salary')
      -> get_node(1)  # not zero-indexed!
      -> textContent;
  }

  sub get_bank_account {
    shift
      -> getElementsByTagName('bank_account')
      -> get_node(1);
  }

  sub pay_salary {
    my $self = shift;
    my $acct = $self->get_bank_account;
    $acct->accept_funds($self->get_salary);
  }
}

{
  package MegaCorp::BankAccount;
  use XML::LibXML::Augment
    -names => ['{http://megacorp.example/}bank_account'];

  sub accept_funds {
    ...
  }
}

{
  package main;
  
  use XML::LibXML::Augment;
  my $doc = XML::LibXML->load_xml(location => 'emp.xml');
  
  # Switch on augmentation for this document!
  XML::LibXML::Augment->upgrade($doc);

  my @employees = $doc->getElementsByTagName('person');
  $_->pay_salary for @employees;
}