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Dokumentation

ABENPREDICATE_EXPRESSIONS - PREDICATE EXPRESSIONS

- Predicate Expressions

...   ${operand  IS $[NOT$] INITIAL$}
    $| ${ref      IS $[NOT$] BOUND$}
    $| ${oref     IS $[NOT$] INSTANCE OF$}
    $| ${<fs>     IS $[NOT$] ASSIGNED$}
    $| ${para     IS $[NOT$] SUPPLIED$} ...

Effect

A predicate expression uses the predicate operator IS to determine a truth value from the state of an operand.

Notes

• Apart from INSTANCE OF, no operands of the possible predicate expressions are general expression positions. No predicate expression can be applied to a calculation expression.

• The predicate expression IS $[NOT$] REQUESTED is obsolete and was replaced by IS $[NOT$] SUPPLIED.