Have you noticed that even if you use the "doctype" view helper to set a xhtml 1.0 strict doctype, if you then use Zend_Form to construct forms, form elements are output like this:

<input type="text" name="date" id="date" value="">


that is very strange!
Anyway i resolved by modify by hand the relative view helper file in the zned library but i think this should be resolved in the future

Had this problem yesterday, too: you have to setup the doctype in bootstrap and then just echo it in your layout.

Bootstrap:

you are right like this it works!! But the manual colud be more clear on this