How to bring a third-party content? Drupal 7.
There is a service, there will send the request, it returns an xml. With the handler present in human readable form. We bring a response variable. How to display the value of this variable on the page? 
I created a page with hook_menu:

function mymodule_menu() {
  $items = array();
  $items['serch'] = array(
    'title' =&gt; 'Result',
    'page callback' =&gt; 'drupal_get_form',
    'page arguments' =&gt; array('mymodule_proc'),
    'type' =&gt; MENU_CALLBACK,
  );
  return $items;
}

function mymodule_proc($parms){

}


In the FORM API I have not found a suitable element.
If use it hook_page_alter, I don't know how apply to the content?

$page['content']['system_main']['pager']
$page['content']
$page['content']['system_main']


or something else....
You can use the #markup property to display arbitrary data.

The function signature for your drupal_get_form callbacks must be:

function mymodule_proc($form, $form_state) {}


Concerning the response object that you want to render, I would need more information in order to help you.