question: called when the document is opened . concode_field_sep ArrayList<PdfPageEvent> events concode_field_sep void addPageEvent concode_elem_sep void onSection concode_elem_sep void onParagraph concode_elem_sep void onParagraphEnd concode_elem_sep void onSectionEnd concode_elem_sep void onEndPage concode_elem_sep void onChapter concode_elem_sep void onGenericTag concode_elem_sep void onCloseDocument concode_elem_sep void onChapterEnd concode_elem_sep void onStartPage
target: void function ( PdfWriter arg0 , Document arg1 ) { for ( PdfPageEvent loc0 : events ) { loc0 . onOpenDocument ( arg0 , arg1 ) ; } }