Is anyone else having trouble getting the Zend_Form class (for ZF version 1.5) to validate as XHTML 1.0 Strict? It validates in XHTML 1.0 Transitional, but not Strict. Can I change a configuration value in the constructor or something?

Whether or not the default HTML output validates, you can use the decorators applied to the form elements to generate any HTML output you want using methods like Zend_Form::setDecorators and Zend_Form::setElementDecorators. What I haven't been able to figure out yet, is how to get to the decorators for the error helper.

Zend Framework: Documentation