C++
virtual bool atExtendedData();
Description
The implementation of this function should follow that of the ObjectARX internal filers. If the filer is currently pointing to an item with an AcDb::DxfCode of AcDb::kDxfXDataStart or AcDb::kDxfRegAppName, then set the filer's internal error status to Acad::eOk. This allows it to move on (much the way the AcDbDxfFiler::atSubclassData method allows the filer to continue past the subclass data marker) and then return true.
The default implementation of this method is to terminate AutoCAD.