Using XML to Connect to Database

I came across a google map tutorial to use XML to connect to a table on a database and print out the markers information stored in the database onto the map. I am building this in a PHP page and I keep getting a XML error XML Parsing Error: junk after document element here is the code.

Code:

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<?php
        require("Login.php");
       
        //Start XML file, create parent node
        $dom = new DOMDocument("1.0");
        $node = $dom->createElement("markers");
        $parnode = $dom->appendChild($node);
       
        //Open a connection to MySQL server
        $connection = mysql_connect(localhost, $username, $password);
                if (!$connection)
                {
                        die('Not connected : ' . mysql_error());
                }
               
        // Set the active Database
        $db_selected = mysql_select_db($database, $connection);
                if (!$db_selected)
                {
                        die ('Can\'t use db : ' . mysql_error());
                }
               
        // Select all the rows in the markers table
        $query = "SELECT * FROM markers WHERE 1";
        $result = mysql_query($query);
                if (!$result)
                {
                        die ('Invalid query: ' . mysql_error());
                }
               
        header("Content-type: text/xml");
       
        // Iterate through the rows, adding xml nodes for each
        while ($row = @mysql_fetch_assoc($result))
                {
                        // ADD TO XML DOCUMENT NODE       
                        $node = $doc->create_element("marker");
                        $newnode = $parnode->append_child($node);
                       
                        $newnode->set_attribute("name", $row['name']);
                        $newnode->set_attribute("address", $row['address']);
                        $newnode->set_attribute("lat", $row['lat']);
                        $newnode->set_attribute("lng", $row['lng']);
                        $newnode->set_attribute("type", $row['type']);
                }
       
        $xmlfile = $doc->dump_mem();
        echo $xmlfile;
       
        ?>

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I hope this is the correct forum since this is both PHP and XML all help greatly appreciated. Thanks