The Add function adds the module definition that defines the language langname to CodeGeneration's table of recognized languages.  This language is then available for use by Translate and Get.

The Get function retrieves the module definition defining language langname.  Note that Get will return a module definition for any defined language, regardless of whether the language has been defined using Define or Add.

The module definition moddef must satisfy certain criteria: see LanguageModule.

moddef := 'module()
   export PrintTarget, Printer;
    PrintTarget := proc() Printer:-PrintTarget(args); end proc:
    Printer := eval(LanguageDefinition[Get]("default")):-Printer;
    Printer:-AddFunction("sin", [anything]::anything, "Sine");
    Printer:-AddOperator(Names:-Assignment = ":=");
end module':

cg := Sine(x);