problem compiling core

Hello,

i have a problem compiling the xml/core modules, concerning the code i have
checked out from cvs, i.e. the 4.0 branch.

When i run all-xml/core from nbbuild/build.xml the following class will not
compile:

org.netbeans.modules.xml.dtd.grammar.DTDGrammar.java

There are problems with the private inner classes, as these don't implement
some of the methods specified by their respective interfaces.

Is this a bug, or still in development?

Best regards

Val