Added more features planned for Expat 3.0.
Added more features planned for Expat 3.0.

libexpat/libexpat,libexpat/libexpat,tiran/expat,tiran/expat,tiran/expat,libexpat/libexpat,libexpat/libexpat,tiran/expat,libexpat/libexpat,libexpat/libexpat