Thanks Dimitry & Derek,
That did the trick. Premise grammar 1.0 complete for now.
Cheers,
~PM
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term ::= number | moment | string | symbol | scheme | collection
number ::= float_positive | float_negative
float_positive ::= '#' [0-9]+ '.' [0-9]*
float_negative ::= '#-' [0-9]+ '.' [0-9]*
moment ::= '@' [0-9]+
letter ::= uppercase | lowercase
lowercase ::= [a-z]
uppercase ::= [A-Z]
digit ::= [0-9]
string ::= '$[' ( letter | digit | " " )* ']'
symbol ::= letter ( letter | digit )*
scheme ::= positional | slotted
positional ::= symbol '(' term ( ',' term )* ')'
slotted ::= symbol '(' slot ':' term ( ',' slot ':' term )* ')'
slot ::= symbol
collection ::= sequence | concurrence | choice | cycle
sequence ::= '[' term* ']'
concurrence ::= '(' term* ')'
choice ::= '{' term* '}'
cycle ::= '<' term* '>'
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AGI
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