Mediawiki tag extension - chained tags do not get processed
function efSampleParserInit( Parser &$parser ) {
        $parser->setHook( 'sample', 'efSampleRender' );
        return true;
}

function efSampleRender( $input, array $args, Parser $parser, PPFrame $frame ) {
    return "hello ->" .  $input . "<- hello";
}

This is the text <sample type="1">hello my <sample type="2">brother</sample> John</sample>

<markdown>
**Look,** here's some Markdown text!
</markdown>