Keywords

Rules

A rule is the most important construct in the grammar of openVALIDATION. It consists of a condition and an action. With a validation rule, the action is always an error message. The easiest way to express such a rule is a IF / THEN construct.

Keyword

Description

IF

Selects the beginning of a rule and the next condition

THEN

Marks the beginning of an error message

AND

Selects the start of a new linked AND condition

OR

Selects the start of a new linked OR condition

Implicit Conditions / Alternative Rule Expression

Keyword

Description

MUST, SHOULD, HAVE, HAS

An indicator identifies an expression as a rule. The condition in such a MUST expression contains an Implicit Negation!

MUST NOT, MUSTN'T, SHOULD NOT, SHOULDN'T, HAS NOT, HASN'T, HAVE NOT, HAVEN'T

An indicator identifies an expression, as a rule

Relational operators

Relational operations always has a left and a right operand and the corresponding comparison operator.

Keyword

Description

IS, EQUAL, EQUALS

A relational operator '=' for numeric and string operands

ISN'T, IS NOT, NOT EQUAL, NOT EQUALS, NOT

A relational operator '!=' for numeric and string operands

LESS, SMALLER, LOWER, FEWER, SHORTER

A relational operator '<' for numeric operands

GREATER, BIGGER, LARGER, MORE, EXCEED, EXCEEDS, HIGHER

A relational operator '>' for numeric operands

GREATER OR EQUAL, GREATER OR EQUALS, LEAST, AT LEAST

A relational operator '>=' for numeric operands

LESS OR EQUAL, LESS OR EQUALS, MOST

A relational operator '<=' for numeric operands

EXIST, EXISTS, GIVEN

A relational operator for non-"null"

DOESN'T EXIST, DON'T EXIST, NOT EXIST

A relational operator for null

Arithmetic operations

Keyword

Description

+, PLUS

A mathematical operation for a simple addition

-, MINUS

A mathematical operation for a simple subtraction

*, TIMES

A mathematical operation for a simple multiplication

/, DIVIDED BY

A mathematical operation for a simple division

MOD, MODULO

A mathematical operation for a simple modulo calculation

Comment

You can write comments in the rulebook. These do not contain any logic.

Keyword

Description

COMMENT

A comment

Error message

Keyword

Description

ERRORCODE, WITH ERRORCODE, WITH CODE, WITH ERROR

Error messages often contain their own error codes for unique identification.