QSP-LSP/Info/ebnf2.txt

ifOne = ifBegin stmtsOne ["else" stmtsOne];
ifBegin = "if" expr ":"
actBegin = "act" expr ":"
actOne = actBegin stmtsOne;
stmtsOne = actOne | ifOne | assign { "&" assign } [actOne | ifOne]

stmtsMultiNl = nl smtsMulti nl {stmtsMulti nl}

actMulti = actBegin (stmtsOne | stmtsMultiNl "end");

elif = ifBegin stmtsMultiNl ("end" | "else" (elif | stmtsMultiNl "end"));

ifMulti = ifOne | elif = ifBegin (stmtsOne ["else" stmtsOne] | stmtsMultiNl ("end" | "else" (elif | stmtsMultiNl "end")))

stmtsMulti = ifMulti | actMulti | assign { "&" assign } [ifMulti | actMulti]