get the static instance of the singleton idlist based on bitmaps . concode_field_sep IdListCreator_Bitmap instance concode_field_sep void addAppearancesInSequence concode_elem_sep void clear concode_elem_sep IDList create concode_elem_sep void addAppearance
IdListCreator function ( ) { if ( instance == null ) { instance = new IdListCreator_Bitmap ( ) ; } return instance ; }