214  Appendix D  Notes:  1. A terminal symbol (literal) is always enl Insed in quotation marks (""); if a "  itself is  enclosed, it is written twice. Thus in the P,,,.:al EBNF below "["and '']'' represent left  and right brackets in a Pascal program, wh .' reas [ and] are meta-symbols in an EBNF  expression that specify zero or one occun  I'nce  of whatever they enclose.  2.  Every syntax has a  start symbol,  a met· identifier from which all the sentences in  the language are generated and which is  11111 used in any EBNF expression. The start  symbol for the Pascal syntax is  Program.  3. Several meta-identifiers are "orphans"  ,~.g.  SignedNumber)  that are used in EBNF  and do not appear in this Appendix. 