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Null statement
The Null statement is a single-step statement used when it is necessary to put at least one statement into curly brackets, but we do not want to perform any particular instruction.
null;
Listing 1. Null statement syntax
Example
An Alvis model must contain at least one active agent. Each active agent pun into the graphical layer must be define in the code layer and vice versa. The simplest model contains one active agent, without ports and with code that consists of a single null statement.
agent A {
null;
}