wordpress XML

<?php
    $new = new WP_Query('post_type=kml');
    while ($new->have_posts()) : $new->the_post();
        if(get_field('marker_datas')):
        while(the_repeater_field('marker_datas')):
            $name = the_sub_field('placemark_name');
// it seems the variables don't store the values - can't echo them, I get only an empty h2
            //echo '<h2>' , $name , '</h2>';
            $description = the_sub_field('placemark_text');
            $styleUrl = the_sub_field('placemark_style_id');
            $Point = the_sub_field('placemark_coordinates');
        endwhile;
        endif;

        endwhile;

class Placemark
{

  public $name;
  public $description;
  public $styleUrl;
  public $Point;

  function __construct(
    $name, $description, $styleUrl, $Point)
  {
    $this->name = $name;
    $this->description = $description;
    $this->styleUrl = $styleUrl;
    $this->Point = $Point;
  }
}

//make placemark object
$placemarks = array(
  new Placemark(
// these variables not working unless I type the values themselves here, the xml nodes are empty
    'this is a placemarks name',
    $description,
    $styleUrl,
    $Point
  )
);

//create the xml document
$xmlDoc = new DOMDocument();

//create the root element
$root = $xmlDoc->appendChild(
          $xmlDoc->createElement("Document"));

foreach($placemarks as $marker)
{
  //create a marker element
  $markerTag = $root->appendChild(
              $xmlDoc->createElement("Placemark"));

  //create the name element
  $markerTag->appendChild(
    $xmlDoc->createElement("Name", $marker->name));

  //create the desc element
  $markerTag->appendChild(
    $xmlDoc->createElement("Description", $marker->description));

  //create the styleURL element
  $markerTag->appendChild(
    $xmlDoc->createElement("styleUrl", $marker->styleUrl));

  //create the coordinate element
  $coordTag = $markerTag->appendChild(
              $xmlDoc->createElement("Point"));
    $coordTag->appendChild(
      $xmlDoc->createElement("coordinates", $marker->Point));
}

header("Content-Type: text/plain");

//make the output pretty
$xmlDoc->formatOutput = true;

echo $xmlDoc->saveXML();
?>