Since various web project frameworks have their own target customers, the
framework development often needs to highlight/customize some project components
as a top-level node under the project physical view for easier access. While
sometimes 'hide' some nodes to prevent users to access or just simplify the view.

For example, Creator would like to show the following components for its JSF
framework as the top-level nodes:
    Managed Beans    (web/WEB-INF/managed-beans.xml)
    Page Navigation  (web/WEB-INF/navigation.xml)
    Session Bean     (src/$BEAN/SessionBean1.java)
    Application Bean (src/$BEAN/ApplicationBean1.java)
    Request Bean     (src/$BEAN/RequestBean1.java)

and also creates the following top-level folder for further adding its special
customized nodes:
    Themes
    Data Source References

While Creator prevent users to see WEB-INF and META-INF for simplicity.
    WEB-INF  (web/WEB-INF)
    META-INF (web/META-INF)