/// <summary>Constructor</summary>
public FilterExpression(Attribute a, FilterOperator op, string rhs) : base(TokenType.Expression)
{
this._attr = a;
this._op = op;
this._operand = rhs;
}
/// <summary>Constructor</summary>
public FilterExpression(Attribute a, FilterOperatorType type, string rhs) : this(a, FilterOperator.GetOperator(type), rhs)
{
}
