12.16.4.9 Predicate Functions
12.16.4.9.1 Testing for an Instance
This function returns the symbol TRUE if the evaluation of its
argument is an instance-address or an instance-name.
Otherwise, it returns the symbol FALSE.
Syntax
(instancep <expression>)
12.16.4.9.2 Testing for an Instance-Address
12.16.4.9.3 Testing for an Instance-Name
12.16.4.9.4 Testing for the Existence an Instance