function getExternalSubset( name : PSAXChar; nameLength : Integer; baseURI : PSAXChar; baseURILength : Integer) : IInputSource;
IBufferedEntityResolver2function resolveEntity( name : PSAXChar; nameLength : Integer; publicId : PSAXChar; publicIdLength : Integer; baseURI : PSAXChar; baseURILength : Integer; systemId : PSAXChar; systemIdLength : Integer) : IInputSource;