In contrast to many other programming languages, YCP variables can be defined at (almost) any point in the code, namely between other statements. Given that, there must be some rules regarding the creation, destruction and validity of variables. Generally variables are valid (accessible) within the block they are declared in. This also covers nested blocks that may exist in this current block. The valid program region for a variable is called a scope.

{
    // Declared in the outer block
    integer outer = 42;

    {
	// Declared in the inner block
	integer inner = 84;

	// This is OK.
	// Log: ...IN: inner: 84 - outer: 42
	y2milestone("IN: inner: %1 - outer: %2", inner, outer);
    }

    // This yields an error because "inner" is not defined any more.
    y2milestone("OUT: inner: %1 - outer: %2", inner, outer);
}