I have a class that has this statement in it as part of its XML functions:

xml_set_element_handler( $this->xp, "FstartElement", "FendElement" );

This worked under 4.0.1pl2, but when I upgraded to 4.0.2 I got errors when the script ran that the handlers could not be found.  When I changed it to:

xml_set_element_handler( $this->xp, array($this,"FstartElement"), array($this,"FendElement") );

The handlers were found, but processing did not seem correct.

I did verify that xml was enabled.