/// <summary>
 /// Creates a new
 /// <see cref="CssSemicolonAtRule"/>
 /// instance.
 /// </summary>
 /// <param name="ruleDeclaration">the rule declaration</param>
 public CssSemicolonAtRule(String ruleDeclaration)
     : base(CssNestedAtRuleFactory.ExtractRuleNameFromDeclaration(ruleDeclaration.Trim()))
 {
     this.ruleParams = ruleDeclaration.Trim().Substring(ruleName.Length).Trim();
 }