Nullifying Composite Objects

Hi All,

This might be a simple question, but wanted a detailed understanding.

Siebel eScript has 2 data types - Primitive & Composite.

Question.1:

Variables of Composite data type should be nullified. Is this correct?

Question.2:

Consider the statements,

var string1 = "john";

var string2:String = "wesly"

Can someone tell me which variable (string1 or string2) is primitive and composite?

Cheers,

John Wesly J.