Recently I am trying to use the DWR library, since my company is behind the firewall, Eclipse is not able to access the dwr schema. so when I decleared the dwr namespace in the spring configuration file:
I got the cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'dwr:controller'. error in my Eclipse 3.3 version.
Inspired by the http://www.jroller.com/habuma/entry/fixing_spring_modules_xsd_errors
I download the http://www.directwebremoting.org/schema/spring-dwr-2.0.xsd and put it into my dwr.jar file and defined an entry in Web and XML" -> "XML Catalog".
The annoying error is gone :)