| X | ::= variable | { domain variable }
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| Constant | ::= integer
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| | inf | { minus infinity }
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| | sup | { plus infinity }
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| Term | ::= Constant
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| | X | { suspend until assigned }
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| | min(X) | { min. of domain of X }
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| | max(X) | { max. of domain of X }
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| | card(X) | { size of domain of X }
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| | - Term
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| | Term + Term
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| | Term - Term
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| | Term * Term
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| | Term /> Term | { division rounded up }
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| | Term /< Term | { division rounded down }
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| | Term mod Term
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| TermSet | ::= {Term,...,Term}
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| Range | ::= TermSet
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| | dom(X) | { domain of X }
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| | Term .. Term | { interval }
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| | Range /\ Range | { intersection }
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| | Range \/ Range | { union }
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| | \ Range | { complement }
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| | - Range | { pointwise negation }
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| | Range + Range | { pointwise addition }
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| | Range - Range | { pointwise subtraction }
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| | Range mod Range | { pointwise modulo }
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| | Range + Term | { pointwise addition }
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| | Range - Term | { pointwise subtraction }
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| | Term - Range | { pointwise subtraction }
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| | Range mod Term | { pointwise modulo }
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| | Range ? Range
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| | unionof(X,Range,Range)
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| | switch(Term,MapList)
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| ConstantSet | ::= {integer,...,integer}
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| ConstantRange | ::= ConstantSet
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| | Constant .. Constant
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| | ConstantRange /\ ConstantRange
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| | ConstantRange \/ ConstantRange
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| | \ ConstantRange
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| MapList | ::= []
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| | [integer-ConstantRange|MapList]
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| CList | ::= []
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| | [integer|CList]
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| Indexical | ::= X in Range
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| Indexicals | ::= Indexical
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| | Indexical , Indexicals
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| ConstraintBody | ::= Indexicals
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| | LinExpr RelOp LinExpr
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| | element(X,CList,X)
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| | relation(X,MapList,X)
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| Head | ::= term | { a compound term with unique variable args }
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| TellPos | ::= Head +: ConstraintBody
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| TellNeg | ::= Head -: ConstraintBody
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| AskPos | ::= Head +? Indexical
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| AskNeg | ::= Head -? Indexical
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| ConstraintDef | ::= TellPos.
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| ?(TellNeg.)
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| ?(AskPos.)
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| ?(AskNeg.)
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