1: doctype public "-//IDN etl.sf.net//ETL//Grammar 0.2.1";
     2: grammar calculator.CalculatorBasic {
     3:     namespace default t = "http://etl.sf.net/samples/calculator";
     4:     context default Expressions {
     5:         op composite NumberLiteral(f) {
     6:             @ value = float | integer;
     7:         };
     8:         op composite StringValue(f) {
     9:             ^ t:StringLiteral {
    10:                 @ value = string(quote='"');
    11:             };
    12:         };
    13:         statement PrintStatement {
    14:             % print;
    15:             @ values += list , {
    16:                 expression;
    17:             };
    18:         };
    19:         statement ExpressionStatement {
    20:             @ value = expression;
    21:         };
    22:     };
    23: };