| LINE | The rule line start character (default is %) signals a statement line which contains a command to the Generator. |
| Rule | The rule start character (default is $) signals the beginning of a rule name. A rule is a package of statements. |
| VARiable | The variable name start character (default is &) signals the beginning of a generator variable name. Variables are assigned values that are substituted where the variable name appears. |
| VariableTERM | The variable name termination character (default is +) signals the end of a generator variable name. The termination character is useful where a variable name is followed by characters that could be part of a variable name. |
| LeftEVAL | The left evaluation bracket (default is <) signals the left boundary of a statement fragment whose content is determined at execution. |
| RightEVAL | The right evaluation bracket (default is >) signals the left boundary of the statement fragment whose content is determined at execution. |
| EVALs | Alternative to specifying LeftEVAL and RightEVAL. The pair of characters to serve as the left and right evaluation brackets (default is < >). |