I have created a rather complicated form to be submitted to search/location. There are two ways to do this, grab the search location form and alter it or if you need to do lots of fancy AJAX stuff which require a vastly different form structure, just recreate it and the lie to Drupal about which form it is -- in other words, steal the identity of search_form. You only need two lines of code in a form_alter (you can't do this in form generation as form_id gets overwritten unconditionally).

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