<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:2.0" version="2.0"
       srcLang="fr-FR" trgLang="en-US">
  <file id="messages.en_US">
    <unit id="LCa0a2j">
      <notes>
        <note category="state">new</note>
        <note category="approved">true</note>
        <note category="section" priority="1">user login</note>
      </notes>
      <segment>
        <source>original-content</source>
        <target>translated-content</target>
      </segment>
    </unit>
  </file>
</xliff>

$catalogue = new MessageCatalogue('en_US');
$catalogue->add([
    'original-content' => 'translated-content',
]);
$catalogue->setMetadata('original-content', ['notes' => [
    ['category' => 'state', 'content' => 'new'],
    ['category' => 'approved', 'content' => 'true'],
    ['category' => 'section', 'content' => 'user login', 'priority' => '1'],
]]);

$dumper = new XliffFileDumper();
$dumper->formatCatalogue($catalogue, 'messages', [
    'default_locale' => 'fr_FR',
    'xliff_version' => '2.0'
]);