Xerces 2.0.0 - DocumentType.getInternalSubset() does it work?!

Hi all,

I switched from Xerces 1.4.3 to Xerces 2.0.0 Beta 4 and I noticed following
difference:

DocumentType.getInternalSubset() doesn't return internal DTD  

Is it bug or is is some setting on parser that I am missing?! Thank you

Tomas