Value :: operator[] - Locate array instance

When accessing array attributes, one may access the complete array or a single value within an array. In order to access array elements, the [] operator has to be used. The operator returns single element, which behaves not as array anymore.

In order to access array elements, an instance has to be selected in the parent property of the array (when existing). Otherwise, an exception is thrown. When trying to access an array element with an index number equal to or higher than the array size, the function throws an exception (no instance available).