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Version: 5.x

IS, AS operators

IS, AS operators create an action that implements classification.

Syntax​

expression IS className
expression AS className

Description​

The IS operator creates an action which returns TRUE if the value of the expression belongs to the specified class.

The AS operator creates a property which returns the expression value if this value belongs to the specified class.

Parameters​

  • expression

    An expression which value is checked for belonging to the class.

  • className

    Class name. Class ID.

Examples​

asOrder(object) = object AS Order;

person = DATA Human (Order);
isMale (Order o) = person(o) IS Male;