How to obtain just the description field of the wire content?

Hi there, Finally I managed to understand a little bit more the new API and now I can login in, check the password and write a new post to thewire using my iphone client application.

But now I am stack with getting information instead of posting or checking parameters.

I would like to check thewire posts for one user. Right now I can get that info, but I obtain a whole html code that lists all the posts, each of them has different fields, for example:

guid: 25

type: object

subtype: 5

owner_guid: 2

container_guid: 2

site_guid: 1

time_created: 1268392788

time_updated: 1268392788

title:

description: PRUEBA1HOLA

------------

But I just want to obtain the owner and the description of the posts (Now I obtain as the example above but with all the posts).

My function is really simple:

function see_thewire($username){
    $user = get_user_by_username($username);
    $arr = array('types' => 'object', 'subtypes' => 'thewire', 'owner_guid' => $user, 'limit' => 10);*/
    $result=elgg_list_entities($arr);
    return $result;
}

What function instead of the elgg_list_entities should I use for this purpose?