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.