Appendices contain supplementary information and are placed after the main text. Ideally, requirements that are part of a standard should be contained in the main body of the standard; however, in books where revisions are made on a regular basis, the addition of supplemental requirements in the form of an appendix may become necessary. All appendices shall be identified as mandatory or nonmandatory, with mandatory preceding nonmandatory.
A mandatory appendix is a part of the standard/code that the author was unable to work into the text. Mandatory appendices are numbered with Roman numerals (e.g., Mandatory Appendix I, Mandatory Appendix II) and follow the same designation system used for the main text, preceded by a Roman numeral and a hyphen (e.g., para.
A nonmandatory appendix is not a part of the standard/code and is added only for purposes of clarification, illustration, example, and general information. No material that is part of the standard/code shall be included in a nonmandatory appendix. Nonmandatory appendices are lettered A through Z and follow the same designation system used for the main text, preceded by a capital letter and a hyphen (e.g., Table A-1, Fig. A-2, C-1, para. C-1.1, para. C-1.12). See Example __.