Jdeveloper 11g namespace error

Question

Hi,
I am using spring security in my application. The applicationcontext.xml has a namespace associated with the schema
http://www.springframework.org/schema/security/spring-security-3.0.xsd. I added the schema url to the XML schemas under reference. But tag elements with this namespace show a 'No grammar available for namespace, element cannot be validated'.
Anyone know why this is:
Here is the file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 3.0//EN" "http://www.springframework.org/dtd/spring-beans-3.0.dtd">
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:security="http://www.springframework.org/schema/security"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
          http://www.springframework.org/schema/security
          http://www.springframework.org/schema/security/spring-security-3.0.xsd">
<security:http auto-config='true'>
    <security:intercept-url pattern="/WEB-INF/jsps/Login.jsp" access="ROLE_USER" />
    <security:form-login
     login-processing-url="/j_spring_security_check"
     login-page="/WEB-INF/jsps/Login.jsp"
     default-target-url="/WEB-INF/jsps/LoginSuccessful.jsp"/>       
  </security:http>
  <security:authentication-manager>
    <security:authentication-provider>
      <security:user-service>
        <security:user name="jimi" password="jimi" authorities="ROLE_USER, ROLE_ADMIN" />
        <security:user name="bob" password="bob" authorities="ROLE_USER" />
      </security:user-service>
    </security:authentication-provider>
  </security:authentication-manager>
</beans>Thanks.

Answer 1

I just tried the following with JDeveloper 11.1.1.2.0:
added the XML schema to tools->preferences
Created a new XML file with the code you provided.
Started a new line under the <security:http auto-config='true'> line
wrote <
I get code insight working just fine showing <security: