doxygen shows incomplete inheritance diagram for class CXXRecordDecl

The CXXRecordDecl is inherits RecordDecl as shown in http://clang.llvm.org/doxygen/DeclCXX_8h_source.html line 266. The doxygen shows incomplete inheritance to CXXRecordDecl as in here http://clang.llvm.org/doxygen/classCXXRecordDecl.html. Moreover it makes no reference to file http://clang.llvm.org/doxygen/DeclCXX_8h_source.html.
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Hello,
I cannot find CXXRecordDecl and many of the CXX-classes at the generated documentation. Is that expected?
Cheers,
Vassil