/// <summary>
/// Builds PDDL logical expression from the input data.
/// </summary>
/// <param name="expression">Input data expression.</param>
/// <returns>Built logical expression.</returns>
public IExpression Build(InputData.PDDL.Expression expression)
{
Debug.Assert(ExpressionStack.Count == 0);
ExpressionStack.Clear();
expression.Accept(this);
Debug.Assert(ExpressionStack.Count == 1);
return(ExpressionStack.Pop());
}