[Zope] standard error messages

[Ethan Fremen]

>From the default standard_error_message:
For example, why does this code:
  <P>
  <STRONG>Error Type: <!--#var error_type--></STRONG><BR>
  <STRONG>Error Value: <!--#var error_value--></STRONG><BR> 
  </P>
 
  <HR NOSHADE>

Generate this:
  </P>
  <P><STRONG>Resource not found</STRONG></P>
  
  Sorry, the requested Zope resource does not exist.<p>Check the URL and
try again.<p>
<!--
foobar
GET
-->
  <HR NOSHADE>

What is error_type? a variable, a method, deep voodo?

-- 
~mindlace