Validation of faces-config file with SYSTEM DTD failed

Hello,

I develop currently an JSF application. My web.xml has an entry

<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>
/WEB-INF/faces-config.xml
</param-value>
</context-param>

I get an error in the Red Hat Developer Studio:
================================================
error: Attribute param-value references to /WEB-INF/faces-config.xml that is not a valid faces config file
================================================

But what is wrong ? The file faces-config.xml is valid and begins with

<?xml version="1.0"?>
<!DOCTYPE faces-config SYSTEM "web-facesconfig_1_1.dtd">
<faces-config>

The DTD-Definition web-facesconfig_1_1.dtd is located in the same folder (under WEB-INF).

The second problem occurs with faces-config.xml if we open one. I miss the 'tree' view to edit more easier the faces config file. If I paste

<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">

instead of SYSTEM "web-facesconfig_1_1.dtd", all views are available. But PUBLIC DTD-Definition can be problematical in the offline mode (intranet applications).

Best regards.
Oleg Varaksin