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rel_exp - Predicate Expressions

Syntax

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

Effect

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

Notes




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rel_exp - IS INITIAL
rel_exp - IS BOUND
rel_exp - IS ASSIGNED
rel_exp - IS SUPPLIED