Файл конфигурации:
<?xml version="1.0" encoding="WINDOWS-1251"?>
<config>
	<host>localhost</host>
	<login>postgres</login>
	<password>11asdf00</password>
	<bd>aud</bd>
	<port>5433</port>
	<tablebd>naud</tablebd>
	<field namebd="id" value=""/>
	<field namebd="name" value=""/>
	<field namebd="capacity" value=""/>
	<field namebd="department" value=""/>
	<field namebd="flag" value="0"/>
	<field namebd="building">
		<value value="1" name="ГУК"/>
		<value value="2" name="УЛК"/>
		<value value="3" name="Э"/>
	</field>
</config>

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ПХП код:
$config=simplexml_load_file("config.xml");
$host_bd=$config->host;
$login_bd=$config->login;
$password_bd=$config->password;
$port_bd=$config->port;
$table_bd=$config->tablebd;
$db_name=$config->bd;
$field_id=$config->xpath("//field[@namebd='id']");
$field_name=$config->xpath("//field[@namebd='name']");
$field_capacity=$config->xpath("//field[@namebd='capacity']");
$field_department=$config->xpath("//field[@namebd='department']");
$field_building=$config->xpath("//field[@namebd='building']");
$field_flag=$config->xpath("//field[@namebd='flag']");

$dbconn = pg_connect("host=$host_bd port=$port_bd dbname=$db_name user=$login_bd password=$password_bd ")
	           or die('Could not connect: ' . pg_last_error());

$module_node = $page->appendChild(new DOMElement('module')); //здесь стоит создать тег этого модуля

$mode = isset($_module_vars[1]) ? $_module_vars[1] : 'default';

if($mode==search)
	{
	//$page->setAttribute('mode','search');
	$request='';
	print "<pre>";
	//print_r($config->field);
	foreach($config->field as $fieldname => $v)
		print_r($v);
	print_r($config);
	die();
	foreach($config->field as $fieldname => $v)
			{
				if(isset($_GET[$fieldname]))
					{
						//print "Q";
						if(!$request) $request.=' AND ';
						$request='"'.$fieldname.'"="'.$_GET[$fieldname].'"';
					}
			}
			//print "SELECT * FROM $table_bd WHERE ".$request;
			//die();
			$res=pg_query($dbconn,"SELECT * FROM $table_bd WHERE ".$request);
			$auditors=pg_fetch_all($res);


				$audit_node=new DOMElement('audit');
				$module_node->appendChild($audit_node);

				foreach($auditors as $aud)
					{
					$aud_node=new DOMElement('aud');
					$audit_node->appendChild($aud_node);
					$aud_node->setAttribute('id', $aud['id']);
					$aud_node->setAttribute('capacity', $aud['capacity']);
					$aud_node->setAttribute('name', $aud['name']);
					$aud_node->setAttribute('floor', $aud['floor']);
					$aud_node->setAttribute('bulding', $aud['bulding']);
					$aud_node->setAttribute('department', $aud['department']);
					$audit_node->setAttribute('flag', $aud['flag']);
					}
	}

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Результат выполнения куска кода print_r($config):
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => id
            [value] =>
        )

)
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => name
            [value] =>
        )

)
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => capacity
            [value] =>
        )

)
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => department
            [value] =>
        )

)
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => flag
            [value] => 0
        )

)
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [namebd] => building
        )

    [value] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [value] => 1
                            [name] => ГУК
                        )

                )

            [1] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [value] => 2
                            [name] => УЛК
                        )

                )

            [2] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [value] => 3
                            [name] => Р­
                        )

                )

        )

)