====== Masken und Screens ======
|<mask>  |:=  |<masktype> ident '{' <maskstlist> '}'  |
|  |  ;  |  |
|<maskstlist>  |:=  |<maskst>  |
|  |  ''|''  |<maskstlist>  |
|  |  ;  |  |
|<masktype>  |:=  |OS_HOMEPAGE  |
|  |  ''|''  |OS_MASK  |
|  |  ''|''  |OS_MENU  |
|  |  ''|''  |OS_MENUBAR  |
|  |  ''|''  |OS_SPECMASK  |
|  |  ;  |  |
|<maskst>  |:=  |<updatemaskst>  |
|  |  ''|''  |OS_HIDDEN  |
|  |  ''|''  |OS_NOWARN  |
|  |  ''|''  |OS_SELUID ';'  |
|  |  ''|''  |OS_SYSPERM ';'  |
|  |  ''|''  |OS_TITLE <number> ';'  |
|  |  ''|''  |OS_POSMASK ident ';'  |
|  |  ''|''  |OS_MMENUBAR ident ';'  |
|  |  ''|''  |OS_IMEXMENUBAR ident ';'  |
|  |  ''|''  |OS_ORDERMENUBAR ident ';'  |
|  |  ''|''  |OS_SELECTMENUBAR ident ';'  |
|  |  ''|''  |OS_SURVOMENUBAR ident ';'  |
|  |  ''|''  |OS_SURVEYMENUBAR ident ';'  |
|  |  ''|''  |';'  |
|  |  ;  |  |
|<updatemaskst>  |:=  |OS_SORTLIST '{' '{' <orderlist> '}' '}'  |
|  |  ''|''  |OS_INDEXLIST [ OS_UNIQUE ] '{' <orderlist> '}'  |
|  |  ''|''  |OS_NMGIVELIST [ OS_REVERSE ] <listpos>\\ '{' <nmgivelist> '}'  |
|  |  ''|''  |OS_NMTAKELIST [ OS_REVERSE ] '{' <nmgivelist> '}'  |
|  |  ''|''  |OS_MFIELDLIST '{' <maskfieldlist> '}'  |
|  |  ;  |  |
|<orderlist>  |:=  |ident ',' <number> ';'  |
|  |  ;  |  |
|<listpos>  |:=  |<listposition> <listtarget>  |
|  |  ;  |  |
|<listposition>  |:=  |OS_BEFORE  |
|  |  ''|''  |OS_AFTER  |
|  |  ;  |  |
|<listtarget>  |:=  |OS_FIRST  |
|  |  ''|''  |OS_LAST  |
|  |  ''|''  |ident  |
|  |  ;  |  |
|<nmgivelist>  |:=  |ident [ OS_NOMPD ] '{'<takefieldlist> '}'  |
|  |  ''|''  |OS_SEPARATOR ident ';'  |
|  |  ;  |  |
|<takefieldlist>  |:=  |ident ',' ident ';'  |
|  |  ''|''  |ident ',' ident ',' <tgflaglist> ';'  |
|  |  ''|''  |<takefieldlist>  |
|  |  ;  |  |
|<tgflaglist>  |:=  |<tgflag>  |
|  |  ''|''  |<tgflaglist>  |
|  |  ;  |  |
|<tgflag>  |:=  |OS_NULL  |
|  |  ''|''  |OS_TGSEL  |
|  |  ''|''  |OS_USERSEL  |
|  |  ''|''  |OS_COPY  |
|  |  ;  |  |
|<maskfieldlist>  |:=  |<addormove> OS_SCREEN <number> OS_TITLE <number> '{' framelist '}'  |
|  |  ''|''  |OS_DELETE OS_SCREEN <number> ';'  |
|  |  ;  |  |
|<framelist>  |:=  |<addormove> ident '[' <number> ',' <number> ']' ';'  |
|  |  ''|''  |OS_UPDATE ident ';'  |
|  |  ;  |  |
|<addormove>  |:=  |OS_ADD  |
|  |  ''|''  |OS_MOVE  |
|  |  ;  |  |