NLI: Function: val & val+

Background: NLI, Expressions, Functions
Related: Examples

The val function gets an existing instance named by specified string.
The instance's class is specified by the element prior to val expression.
The val+ function creates an instance, if specified one does not exist.

General Format:
(get entity attribute (val 'nameOfAttributeInstance))
(get entity attribute (val+ 'nameOfAttributeInstance))

(get john gender (val 'male))
(get john gender (val+ 'male))

(get john gender (val+ 'male))
is approximately equivalent to
(get john gender (get+ gender instance 'male)).
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