## Expression language for functions and rules:

a == b | equality |

a != b | inequality |

a < b | a is less than b |

a <= b | a is less than or equal to b |

a > b | a is greater than b |

a >= b | a is greater than or equal to b |

a + b | addition |

a – b | subtraction |

a * b | multiplication |

a / b | division |

a % b | modulo |

!a | logical negation |

-a | arithmetic negation |

a && b | logical conjunction, AND-conjunction |

a ^ b | logical exclusive disjunction, XOR-disjunction |

a || b | logical disjunction, OR-disjunction |

a implies b | logical implication (if a, then b) |

a <=> b | logical equivalence |

a * (b + c) | brackets |

if a then b else c |
distinction of cases (always has to be complete: “if … then …” will not be evaluated!) |

a@pre | previous value in accordance with the quantization |

a@pre@pre | penultimate value in accordance with the quantization |

a@pre(X) | previous value in accordance with chosen parameter: with X = HOUR, DAY, WEEK, MONTH, QUARTER, YEAR |

a@pre(X)@pre(X) | penultimate value in accordance with chosen parameter: with X = HOUR, DAY, WEEK, MONTH, QUARTER, YEAR |

a@next | next value in accordance with the quantization |

a@next@next | next but one value in accordance with the quantization |

a@next(X) | next value in accordance with chosen parameter: with X = HOUR, DAY, WEEK, MONTH, QUARTER, YEAR |

a@next(X)@next(X) | next but one value in accordance with chosen parameter: with X = HOUR, DAY, WEEK, MONTH, QUARTER, YEAR |

dayOfYear() | provides the current day of the year, for example 01.01.2014 provides “1”, 02.01.2014 provides “2” etc. (no parameter) |

weekOfYear() | provides the current week of the year, for example 01.01.2014 provides “1”, 06.01.2014 provides “2” etc. (no parameter) |

min(a_1; …; a_n) | minimum of a_1 to a_n |

max(a_1; …; a_n) | maximum of a_1 to a_n |

exp(a) | e raised to a (e represents a natural number) |

exp(a; b) | a raised to b (a and b can be numbers, sensors or both mixed) |

log(a) | common logarithm of a |

ln(a) | natural logarithm of a |

sqrt(a) | square root of a |

abs(a) | absolute value of a |

avg(a_1; …; a_n) |
average of a_1 to a_n |

/*comment*/ | syntax for the comment-funktion |