PPT Slide
C.21
DERIVATION
A derivation of a syntactic construct
from a BNF grammar shows the steps
required to derive the construct using
that grammar.
<identifier> ? <alpha> <anstring>
? <alpha> <anstring> <num>
? <alpha> <alpha> <num>
? X <alpha> <num>
? X Q <num>
? X Q 2
Derivation of identifier XQ2
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