Note that many things (such as the format of a first-name, apartment number, ZIP-code, and Roman numeral) are left unspecified here. If necessary, they may be described using additional BNF rules.
nOtE thAt many thINgs (SuCH AS THe fOrMaT Of A First-name, apARtment nUmber, Zip-code, AnD romAn nuMerAL) aRe leFt unspecified herE. if necESsarY, tHEY maY Be dEscriBEd usIng adDitIonAL bnf ruLeS.