b) boolean marker{A341j ,A348b} : letter b{94a } symbol. {Example:
}
aa) The mode which is output (input) compatible with a 'boolean' pattern is that specified by BOOL (REF BOOL)
bb) A value V is converted to a string using a 'boolean' pattern as follows:
· if V is true (false), then the string is that yielded by flip (flop).
cc) A string S is converted to a boolean value, using a 'boolean' pattern, as follows:
· if S is the
same as the string yielded by flip (flop), then the required
value is true (false).}
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