# null

This special value refers to something undefined. It may indicate...

- an undefined default reference, e.g. for the initialization of variables to handle default references (i.e., activated altsteps).
- an undefined address, e.g. for the initialization of variables of the address type.

Related keywords:

- address
- altstep
- activate
- default

### null

Example 1:

var default vd_DefaultVariable := null;

The variable vd_DefaultVariable is declared and given the initial value null.

Example 2:

var address v_MySUTentity := null;

The variable v_MySUTentity is declared and given the initial value null.

BNF definition of null