| term-read-in | ::= subterm(1200) full-stop
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| subterm(N) | ::= term(M) | { where M is less than or equal to N }
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| term(N) | ::= op(N,fx) subterm(N-1) | { except in the case of a number if subterm starts with a ‘(’, op must be followed by layout-text }
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| | op(N,fy) subterm(N) | { if subterm starts with a ‘(’, op must be followed by layout-text }
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| | subterm(N-1) op(N,xfx) subterm(N-1)
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| | subterm(N-1) op(N,xfy) subterm(N)
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| | subterm(N) op(N,yfx) subterm(N-1)
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| | subterm(N-1) op(N,xf)
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| | subterm(N) op(N,yf)
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| term(1100) | ::= subterm(1099) | subterm(1100) | { term with functor ;/2 }
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| term(1000) | ::= subterm(999) , subterm(1000) | { term with functor ','/2 }
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| term(0) | ::= functor ( arguments ) | { provided there is no layout-text between the functor and the ‘(’ }
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| | ( subterm(1200) )
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| | { subterm(1200) }
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| | list
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| | string
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| | constant
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| | variable
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| op(N,T) | ::= name | { where name has been declared as an operator of type T and precedence N }
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| arguments | ::= subterm(999)
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| | subterm(999) , arguments
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| list | ::= []
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| | [ listexpr ]
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| listexpr | ::= subterm(999)
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| | subterm(999) , listexpr
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| | subterm(999) | subterm(999)
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| constant | ::= atom | number
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| number | ::= unsigned-number
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| | sign unsigned-number
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| | sign inf
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| | sign nan
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| unsigned-number | ::= natural-number | unsigned-float
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| atom | ::= name
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| functor | ::= name
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