// A = { B } "x" { C}. // A = [ X] "y" [ Y]. LastName = Ident. A = B C {"bd" D "ed"} {"be" ["x" E] "ee"} [ F]. before part LastName.x : "last: " before inside optional part LastName.x : "last: " before class LastName : "last: " before class FirstName : "first: " after class FirstName : "hello sir" after class FirstName : "yes yes" before class LastName : "no no" after class LastName : "yes wow ok no" before class LastName : "jum jum" after class Date : "this is the date yup" before class Date : "before before before" after collection List } : ")" before collection List } : "(" after collection List { : "[" before collection List { : "]" before collection List { : "opo" after collection List } : "opo"